Grade 10Physical Chemistry
Calculate the pH of a solution which contains 9.9 ml of 1 M HCI and 100 ml of 0.1 M NaOH
Calculate the pH of a solution which contains 9.9 ml of 1 M HCI and 100 ml of 0.1 M NaOH
1 Answer
Arun
Na OH reacts with H Cl :
Na OH + H Cl → Na Cl + H2O
1 mol Na OH reacts with 1 mol HCl
Mol H Cl in 9 . 9 m L of 1 . 0 M solution = 9.9 /1000 * 1.0 = 0.0099 mol H Cl
Mol Na OH in 100mL of 0.1 M solution = 100 / 1000 * 0.1 = 0.01 mol Na OH
On mixing the 0.0099 mol H Cl will be neutralized and 0.01 - 0.0099 = 1 * 10 ^ - 4 mol Na OH dissolved in 109.9 m L solution
Morality of Na OH solution = ( 1 * 10 ^ - 4 ) / 0.1099 = 9.099 * 10 ^ - 4 M
p OH = - log ( 9.099 * 10 ^ - 4)
p OH = 3.04
pH = 14.00 – p OH
pH = 14.00 - 3.04
pH = 10.96
Na OH + H Cl → Na Cl + H2O
1 mol Na OH reacts with 1 mol HCl
Mol H Cl in 9 . 9 m L of 1 . 0 M solution = 9.9 /1000 * 1.0 = 0.0099 mol H Cl
Mol Na OH in 100mL of 0.1 M solution = 100 / 1000 * 0.1 = 0.01 mol Na OH
On mixing the 0.0099 mol H Cl will be neutralized and 0.01 - 0.0099 = 1 * 10 ^ - 4 mol Na OH dissolved in 109.9 m L solution
Morality of Na OH solution = ( 1 * 10 ^ - 4 ) / 0.1099 = 9.099 * 10 ^ - 4 M
p OH = - log ( 9.099 * 10 ^ - 4)
p OH = 3.04
pH = 14.00 – p OH
pH = 14.00 - 3.04
pH = 10.96
Regards
Arun
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