JEE Mains · Chemistry · STD 11 - 1. Some basic concept of chemistry
The molarity of \(1 \mathrm{~L}\) orthophosphoric acid \(\left(\mathrm{H}_3 \mathrm{PO}_4\right)\) having \(70 \%\) purity by weight (specific gravity \(\left.1.54 \mathrm{~g} \mathrm{~cm}^{-3}\right)\) is _______ \(\mathrm{M}\). (Molar mass of \(\mathrm{H}_3 \mathrm{PO}_4=98 \mathrm{~g} \mathrm{~mol}^{-1}\) )
- A 9
- B 10
- C 11
- D 12
Answer & Solution
Correct Answer
(C) 11
Step-by-step Solution
Detailed explanation
Specific gravity (density) \(=1.54 \mathrm{~g} / \mathrm{cc}\). Volume \(=1 \mathrm{~L}=1000 \mathrm{ml}\) Mass of solution \(=1.54 \times 1000\) \(=1540 \mathrm{~g}\) \(\%\) purity of \(\mathrm{H}_2 \mathrm{SO}_4\) is \(70 \%\) So weight of…
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