sapling earning You need to determine the concentration of a sulfuric acid solut

Question

sapling earning You need to determine the concentration of a sulfuric acid solution by titration with a standard sodium hydroxide solution. You have a 0.1666 M standard solution. You take a 25.00 mL sample of the original acid solution and dilute it to 250.0 mL. You then take a 10.00 mL sample of the dilute acid solution and titrate it with the standard solution. You need 16.26 mL of the standard solution to reach the endpoint. What is the concentration of the original acid solution? Number M Concentration

Explanation / Answer

First write the reaction of H2SO4 and NaOH-

2 NaOH + H2SO4 Na2SO4 + 2 H2O

(0.01626 L) x (0.1666 mol/L NaOH) x (1 mol H2SO4 / 2 mol NaOH) x (250.0 mL / 10.00 mL) /
(0.02500 L)

= 1.35 mol/L H2SO4 originally

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