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myrzilka [38]
3 years ago
11

Question 1 a chemist dissolves 154.mg of pure hydrochloric acid in enough water to make up 170.ml of solution. calculate the ph

of the solution. be sure your answer has the correct number of significant digits
Chemistry
1 answer:
Nina [5.8K]3 years ago
3 0
HCl is a strong acid and completely dissociates to give out H⁺ ions
Therefore [HCl] = [H⁺] 
number of HCl moles - 154 x 10⁻³ g/ 36.5 g/mol = 4.22 mmol 
[HCl] = 4.22 x 10⁻³ mol / 0.170 L = 0.025 M
therefore [H⁺] = 0.025 M
by knowing the H⁺ concentration, pH can be calculated
pH = -log[H⁺]
pH = -log (0.025 M)
pH = 1.60 
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