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CBSE Class 11-science Answered

<div>&nbsp;</div> <div>Q) Percentage purity of gold in 10g of chain marked 20carat (puregold=24carat)-</div> <div>1)80% &nbsp;2)91.6% 3)83.33% 4)96%</div> <div>Q) The crystalline salt Na2SO4.xH2O on heating loses 55.9% of its weight ; the value of x in the crystalline salt is -</div> <div>1)5 2)7 3)2 4)10</div>
Asked by shubhamjindal | 19 Jun, 2014, 11:16: PM
Expert Answer
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Solution to second question:
The crystalline salt Na2SO4.xH2O on heating loses 55.9% of its weight ; the value of x in the crystalline salt is -
1)5 2)7 3)2 4)10
Correct option: 4

Consider 100g of Na2SO4.x H2O

On heating it loses 55.90g of water.

Mole proportion Na2SO4 = 44.10, H2O = 55.9

Na2SO4 = 44.10 = 0.3106

142

H2O = 55.90 = 3.106

18

So let us divide by the smallest, so we have mole proportion as Na2SO4.H2O = 1:10

So the salt is Na2SO4.10H2O

Answered by Vaibhav Chavan | 20 Jun, 2014, 10:32: AM
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