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98 g sulphuric acid is dissolved in water to make 2 L solution. If the acid completely gives two hydrogen ions, what is the molarity of hydrogen ions?
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Answer and explanation
Correct answer: 1.0 mol L^-1
The molar mass of H2SO4 is 98 g mol^-1, so 98 g represents 1 mol. In 2 L, its molarity is 1/2 = 0.5 mol L^-1. Complete ionisation gives two H+ ions per acid molecule; therefore [H+] = 2 × 0.5 = 1.0 mol L^-1. This follows the stated ideal complete-ionisation assumption.
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What is the correct answer to this question?
1.0 mol L^-1
Why is this the correct answer?
The molar mass of H2SO4 is 98 g mol^-1, so 98 g represents 1 mol. In 2 L, its molarity is 1/2 = 0.5 mol L^-1. Complete ionisation gives two H+ ions per acid molecule; therefore [H+] = 2 × 0.5 = 1.0 mol L^-1. This follows the stated ideal complete-ionisation assumption.
Which subject and chapter does this question cover?
This is a Class 11 Chemistry question. Chapter: Chapter 01: Solutions.
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