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A solution of HCl has an unknown concentration. 10.00 mL of the HCl solution was measured...

A solution of HCl has an unknown concentration. 10.00 mL of the HCl solution was measured and several drops of phenolphthalein were added. The solution remained colorless. A quantity of 84.51 mL of 1.000 M NaOH was added before a pink color persisted in the solution. What was the concentration of the HCl solution?
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Answer :-

Firstly a balanced chemical equation between NaOH and HCl is written then using the stoichiometry, concentration of HCl is calculated.

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