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Two drops of phenolphthalein was added t...

Two drops of phenolphthalein was added to 40 " mL of " HCl solution. When 30 " mL of " 0.1 M NaOH was added, part of the the solution turned pink, but colour disappeared on mixing the solutiion. Addition of NaOH was continued drop-wise untill a one-drop addition produced a lasting pink colour, and the colume of NaOH added was 32.56 mL. Calculate The concentration of HCl solution.

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To solve the problem, we will follow these steps: ### Step 1: Understand the Reaction We know that hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) in a 1:1 molar ratio: \[ \text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O} \] ### Step 2: Calculate the mEq of NaOH First, we need to calculate the milliequivalents (mEq) of NaOH that were added to the solution. The formula for milliequivalents is: ...
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