Question

what is the pH of 0.40 M solution

Answer 1

Here is your answer
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1.29 is the pH of 0.40 M solution.

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 0.1 M HCl has 0.1 moles of Hydrogen Chloride per liter of solution.

Answer 2

hey write your question completely...
where is ur phosphoric acid and temp...??
the answer is 1.29