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A 150 mL sample of hydrochloric acid (HCl) completely reacted with 60. 0 mL of a 0. 100 M NaOH solution. The equation for the reaction is given below. HCl NaOH Right arrow. NaCl H2O What was the original concentration of the HCl solution? 0. 040 M 0. 25 M 1. 50 M 2. 50 M.

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Answer:

The balanced chemical reaction is expressed as:

HCl + NaOH ---> NaCl + H2O

We are given the amount and the concentration of the sodium hydroxide reactant. This will be the starting point for the calculations.

0.100 mol NaOH/L solution (0.06 L solution) ( 1 mol HCl / 1 mol NaOH) = 0.006 mol HCl

Molarity = amount in moles / Volume of solution = 0.006 mol HCl/ 0.150 L

Molarity = 0.04 M

Explanation: