DessyDee
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A total of 25.0 mL of 0.150 M potassium hydroxide (KOH) was required to neutralize 15.0 mL of sulfuric acid (H2SO4) of unknown concentration. What is the concentration of the sulfuric acid? please help

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For neutralization of acid by a base (or vice versa), the equation should be used.
                          M₁V₁ = M₂V₂
where M's are the molarity and the Vs are the volume. Substituting the known values,
                        (0.150M)(25) = M₂(15 mL)
The value of M₂ from the equation is equal to 0.25M. Thus, the concentration of the acid is 0.25M. 

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