Q.5. In order to find the strength of a sample of sulphuric acid , 10 g of it were taken and a piece of marble weighing 7g placed in it. When the reaction is ceased,the marble piece was dried and it was found to weigh 2.2 g. What is percent strength of sulphuric acid?
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mass of the marble=7gmass of the marble left unused=2.2ghence,mass of the marble reacted=7.0g-2.2g=4.8gnow,according to the reaction invovled in the q.100g of CaCO3 reacts with 98g of h2so4 to form caso4,h2o and CO2so,100g of marble react with=98g of H2SO4hence 4.8g of marble will react with=98/100x4.8=4.704gsince 10 of dil.H2so4 will contain pure h2so4=4.704ghence 100g of dil.h2so4 will contain pure h2so4=4.704/10x100=47.04gHence the % strength of h2so4 is 47.04
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