Monday
November 24, 2014

Homework Help: science

Posted by cara on Wednesday, April 1, 2009 at 4:37pm.

I did a hydrate lab in school and these were my results and at the end we have to write the correc formula for the hydrate but I know the answer at the end is supposed to be 5H2O so why do I keep getting 4H2O? Can someone double check my work
Mass of evaporating dish 35.88


Mass of Dish and hydrated chemical 39.46


Calculated mass of hydrated chemical only 3.58


Mass of dish and chemical after 1st heating 38.40


Mass of dish and chemical after 2nd heating 38.40


Mass of dish and chemical after 3rd heating (if needed)



Now calculate the following:

Mass of anhydrous chemical only 38.40-35.88= 2.52 g


Mass of water lost. 1.06 g


% of hydrate the anhydrous chemical is. 2.52/3.58= 70.39%


Molar Mass of anhydrous Copper (II) sulfate 159. 6


226.7


Molar weight of water lost 67.2

Total number of moles of water
226.7-159.6= 67.1 67.1/18.02= 3.723 mols= 4


Prefix
tetra

Correct formula for the hydrate
CuSo4 4H20

Answer this Question

First Name:
School Subject:
Answer:

Related Questions

Chemistry - I need help with this lab. Write the equation for the decomposition ...
chemistry - this is for a lab - determining the chemical formula of a hydrate. ...
chemistry - A 2.50 g sample of a hydrate of calcium sulphate losses 0.523 g of ...
chemistry - A 2.500 gram sample of hydrate of calcium sulfate loses 0.532 grams ...
chemistry - Cobalt(2) chloride is commonly obtained from chemical supply houses ...
chemistry - I need help with this lab. Write the equation for the decomposition...
chemistry - What is the actual hydrate formula for Barium Chloride? I did a lab ...
Chemistry - A 32.907-g sample of a hydrate of Au (CN)3 contains 5.406 g H2O What...
Chemistry - During your experiment, you are drive water from the hydrate M x X y...
chemistry - In the experiment, a hydrate is heated to form an anhydrate. The ...

Search
Members