# Why must you measure the mass of the anhydrous salt immediately upon cooling

How is the formula weight for a hydrate calculated? Determine the mass of the water that has left the compound.

Take the mass of the hydrate and subtract the mass of anhydrate from that to get the mass of water. Convert the mass of water to moles. See Full Answer. How do you calculate a formula weight? Go to periodic table and determine the atomic mass average atomic weight of each element. Multiply each atomic mass by the number of atoms in the formula.

### Using Einstein's formula:

Add up the results of step three: 2. Molecular weight is the sum of the atomic weights of atoms in a molecule's molecular formula. Formula weight is the sum of the atomic weights of the atoms in a molecule's empirical formula. Molecular formula is a notation that indicates the type and number of atoms in a molecule. The molecular weight is the mass of one mole of a substance. Usually, the units used for this are grams per mole. In this movie, we show how to calculate the molecular weight of a substance from the atomic weights given on the periodic table.

Formula mass is the sum of the atomic weights of atoms in a molecule. What is the formula for weight? Since the weight is a force, its SI unit is the newton. Figure out the mass of an object. Figure out the gravitational acceleration. Plug the numbers into the equation. In physics the standard unit of weight is Newton, and the standard unit of mass is kilogram. On Earth, a 1 kg object weighs 9. Or, to find the mass in kg, divide the weight by 9.

See Table at measurement. See Note at weight. What is the formula for weight units? For example magensium chloride has the formula unit MgCl2i. In CsCl, each ion has a coordination number of 8. What is the formula of a hydrate? A hydrate is an ionic compound that contains water molecules in its structure. How are mole ratios written from a balanced chemical equation? A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction.

The numbers in a conversion factor come from the coefficients of the balanced chemical equation.Coming soon to the internet's top social site Facebook! Check back soon to follow us and connect with our community members. Coming soon to Twitter. Check back soon to follow our tweets. Answered Unanswered. What would you like to ask? Please check and try again. This is NOT abusive. I pressed this button by accident.

It is offensive or harmful. It does not contain enough information. It contains or requests illegal information. It does not make sense. Consumer Electronics. Cats Dogs Rodents. Q Why must you measure the mass of thhe anhydrous salt immediately upon cooling? Why it is necessary to measure the mass of the anhydrous salt immediately after cooling. Top Solutions. CuSO4 becomes hydrated and the color will change from white to blue. The formula therefor I had a ultrasound on nov24th Add your answer.

Suggested Solutions 10 What's this? X depends on how much water you add to it. Was this answer helpful? Yes No. This answer closely relates to:. Anonymous 8. Isthmus measures 0. It could mean the Microsoft is not valid, virus present, need more memory. Measure the size of itovidki, control the shape. Check that there are no nodules.

Anonymous 0. The subsequent molecular formula would have much fewer waters in it as a result from. Install two way registers u can buy at any home store. What is the mass percent of N2O5?In an experiment in which I had to heat a hydrate copper sulfate xhydrate to form an anhydrous salt, I had to measure the mass of the evaporating dish, hydrate, and anhydrous salt.

Any idea why the anydrous salt has to be measured immediately after it is cooled? I am chemist and work with anahydrous Sodium Sulfate all the time. Once the salt is dry and cooled, the heat from the salt can no longer emit heat energy to evaporate more water off. If you measure the mass of the salt while hot or warm, the mass will constantly change because its giving off something, like water.

Once cool though, it can start to collect water again from the atmosphere and gain mass. This is why weighing a anahydrous salt at just the right time is essential. The fact that the question specifies an "anhydrous salt" implies that the salt spontaneously absorbs water [from the air] and becomes hydrated. When the salt becomes hydrated, the weight of the water absorbed effects the weight of the overall substance.

Answer Save. Well, I am chemist and work with anahydrous Sodium Sulfate all the time. Hope this helps. The Chemist. Wee Man. Rae Lv 4. Still have questions? Get your answers by asking now.A desiccator is a glass or plastic container that can be sealed in which a small amount of desiccant material is placed in the bottom. A level platform sits above the desiccant. Scientists store chemicals and allow items to cool in the desiccator. Heated samples and beakers, or weighing dish, are cooled in a desiccator to prevent the sample or beaker from gathering moisture as it cools.

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The interior of the desiccator is dry due to the desiccant at the bottom and because it is sealed to keep outside, moist air from getting inside. If a sample is allowed to cool in the open air of the laboratory, it will absorb water from the air. If you need to make precise weight measurements, this added water weight will give an incorrect measurement. Weighing the sample while it is hot also will cause inaccurate measurements because as the sample cools, the weight fluctuates.

This fluctuation may be slight, but it can still throw off the results. Hydrophilic chemicals, or ones that easily absorb water, are always stored in a desiccator. This keeps the chemicals dry and makes them last longer. Based in Portland, Ore. Her articles have appeared in magazines such as "Herb Companion" and "Northwest Travel" and she is the author of six books. About the Author. Photo Credits. Copyright Leaf Group Ltd.All Rights Reserved.

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Unanswered Questions. Why must anhydrous salt be measured immediately upon cooling? Wiki User Convection currents bro. Asked in Health, Temperature Temperature of a baby If you have measured the baby correctly, then this is very, very dangerous. Consult the thermometer guide for info on how to properly measure. Asked in Science, Chemistry How do you estimate anhydrous magnesium sulfate is enough to use?

You must state the purpose of using MgSO4. Asked in Metric System What is always measured in cubic units? Volume must be measured in cubic units. Asked in Chemistry, Evaporation and Condensation Why must you allow evaporating dishes to cool before measuring the mass?

More Vapours come out of evaporating dishes when hot, and there is loss of some weight during this process. So the mass is measured after cooling. Asked in Example Sentences How do you put immediately in a sentence? You must get to a hospital immediately. If you do not respond to this notice immediately, your insurance will no longer be valid.

Asked in Oil and Oil Filters How do you repair when engine oil has gotten into the cooling system? You have a blown head gasket, cracked head, or both. The engine must be dissembled to make the repair. Stop driving this car immediately or you will destroy the engine. Asked in Chemistry, Temperature What are the properties of a good thermometric liquid?

Asked in Rules of the Road What type of road sign instructs a driver of actions that must be obeyed immediately? These signs instruct a driver of actions that must be obeyed immediately. Asked in Chemistry During the cooling of the naphthalene why the boiling tube must be placed in a conical flask? Asked in Chemistry What are the cheracteristics of a substance that can be observed and measured?

A substance must have the properties of physical properties in order to be observed and measured. Asked in Science Why must an object to be measured grams be at the center of the balance? Not true, it must be on a balance pan. Most auto parts stores sell cooling flushing kits. Get one follow the directions and it should take the air out of the system.

You must remember that your heater is part of the cooling system as well as the cooling for your transmission. I must speak with a haberdasher immediately. Asked in Science, Chemistry, Density How would you find the density of a lump of sodium that is about 10 grams? The volume must be determined; try the method of liquid displacement using an anhydrous mineral oil.All Rights Reserved. The material on this site can not be reproduced, distributed, transmitted, cached or otherwise used, except with prior written permission of Multiply.

Hottest Questions. Previously Viewed. Unanswered Questions. Cooking Measurements. Wiki User Salt is measured like any other dry ingredient. It should be leveled on the top of the measuring spoon or cup.

A pinch is measured by pinching an amount between the thumb and forefinger. The concentration of salt in water is measured with a salinometer or by the chemical determination of chlorine or sodium. I measured with a new lb of salt and measured approximately 30 tablespoons of salt per pound.

Your Welcome! Have a great day! Asked in Units of Measure What unit would you use to measure salt? If salt is less in quantity it is measured in mg else it is measured in gm or kg. Food ingredients such as salt, sugar, etc.

Asked in Weight and Mass What are some things measured in kilograms? Sugar Salt Coffee Beans. Asked in Weight and Mass What kind of food is measured in kilograms? Asked in Chemistry Why must anhydrous salt be measured immediately upon cooling? Convection currents bro. Percentages of salt found in seawater is known as salinity.

The salinity in water can be measured using a refractometer or a salinity sensor.

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Asked in Weight and Mass The names of five things that are measured by meters and kilograms? There are 16 Tablespoons in a cup regarless of what is being measured. Asked in Chemistry PH of salts insoluble in water? If the salt is insoluble, any ions in water and the measured pH is the pH of water. Asked in Chickens and Roosters Do brine shrimp eggs need salt in order to hatch?By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service.

Chemistry Stack Exchange is a question and answer site for scientists, academics, teachers, and students in the field of chemistry.

It only takes a minute to sign up. After we heated the crucible we were to cool it down using a Desiccator. Then this question came to my mind: Why must we cool it down? By doing researches in the Net I were only able to come up with these suggestions, but none seem very applicable for me:. Anyone sane, and with regards to the value the balance has in the lab, would give slightest chances that the hot container would harm the surface of the balance and therefore, damage it.

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But chances are that I'm wrong too. So, why must we cool the crucible in order to measure the mass of the sample in it using a balance?

## Why Do You Let the Sample Cool in a Dessicator?

A container that is not at ambient temperature will generate air currents around it. If you place such a non-ambient container in a balance, air currents will develop around the container as it heats or cools to ambient. These air currents will cause the balance to read incorrectly. The other two answers here are fine; it's true that as the hot object you're trying to weigh warms the air around it, the air will rise, creating air currents that will give you an unsteady reading.

The balance pan will heat up, too, causing metal parts in the balance to expand. This will also contribute to an error in your reading, and as the metal cools, the reading will change.

Another contribution to the error is that the density of a hot sample is less than the density of a cold sample, so its buoyancy is different. The object will appear to gain a tiny amount of weight as it cools!

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And a fourth thing: if you put a hot object into an air-tight dessicator, the air inside will contract as the object coolsand you might have some trouble getting the lid off again! Your gut feeling is right: Very hot crucibles can cause damage to the balance. However, this isn't the main reason for why chemists cool their samples down before measurement. We are all familiar with convection currents : When air is heated the molecules will collide more than its previous state; resulting in an increase in either volume or pressure depending on the "flexibility" of the environment of effect.

Thus, the density of hot air decreases, and it goes up and "replaces" the cold air. If the process of heating the air continues, hot air will continuously go up in what we call a "convection current".

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