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A solution of NaOH was standardized by gravimetric titration of a known quantity of the primary standard, potassium hydrogen phthalate:

The was then used to find the concentration of an unknown solution ofH2SO4

H2SO4+2NaOH→Na2SO4+2H2O

A 10.00-mL aliquot of H2SO4solution required 57.911 g of NaOH solution to reach the phenolphthalein end point. Find the molarity of H2SO4

Short Answer

Expert verified

The molarity of sulfuric acid in the titration of NaOHVsH2SO4is 0.305M.

Step by step solution

01

Define the molarity

The total number of moles of solute per liter of solution is known as a solution's molarity. Because, unlike mass, the volume of a system fluctuates with changes in physical conditions, the molality of a solution is affected by changes in physical parameters of the system such as pressure and temperature. Molarity is represented by the letter M, which stands for a molar.

The molarity of a solution is defined as one gramme of solute dissolved in one litre of solution.

02

Step 2: Calculate the molarity of H2SO4

The molarity of a solution can be given by the formula

Molarity(M)=(Molesofsolute(inmol)(Volumeofsolution(inL)

The molarity of sulfuric acid in the titration ofNaOHVsH2SO4

molNaOH=(0.057911kgsolution)(O.10531mol/kgsolution)

=6.0986mmol

The ratio of sodium hydroxide to sulfuric acid is 2 : 1

[H2SO4]=0.5×6.098mmol10.00mL

=0.305M

Thus, the molarity of sulfuric acid in the titration ofNaOHVsH2SO4 is 0.305M

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