What will be the effect on the mass of the MSH sample of: Overheating the MSH hy

Question

What will be the effect on the mass of the MSH sample of: Overheating the MSH hydrate so the compound decomposes. Will this likely load to a higher or lower coefficient value on the water of hydration? Not heating enough the MSH hydrate to drive off all the water of hydration in the MSH. Will this likely lead to a higher or lower coefficient value on the water of hydrations? What is meant by "heating to constant mass", and why is important? An iron(III) sulfate hydrate is 18.4% water. What is the formula of the hydrate? What is the name of the hydrate? The hydrate of ionic compound X has a molar mass of 124.1 g/mol and 43.56% water. What is the molar mass of X?

Explanation / Answer

MSH = Magnesium Silicate Hydrate

Q1.

overheating might "burn" the content, therefore decrease in mass since some ash could lfy away

it will have a a lower value

b

not heating enough will not favour hydation

Q2.

heating at constant mass, means, that the mass should not change as we heat it, i.e. the mass should remain the same as we increase/add heat

Q3.

Fe(SO4)3 * H2O is 18.4% water...

assume 100 g basis

mol of H2O = mass/MW = 18.4/18 = 1.02

mol of fe = (100-18.4)/399.88 = 0.204

ratio 1.02/0.204 = 5

so

Fe(SO4)3*5H2O is the formula

Q4.

X*H2O

assume a basis of 100 g

so

43.546 g are water

mol = mass/M W= 43.546/18 = 2.419

now..

Total MW = MW1 + MW2 = 2.419*18 + 56.454*X = 124.1

x = (124.1- 2.419*18)/56.454 = 1.42 mol

MW = mass/mol =56.454/1.42 = 39.7 g /mol

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