Question

verify your calculation
did you report your data to the correct number
of significant figures?
initial volume of buret (ml) 1.00
mass of khp (g) 1.900
observations
it turns purple
final volume of buret (ml) 30.35
volume of naoh (ml) 29.35
concentration of naoh (m)
how to calculate sodium hydroxide concentration

Explanation:

Step1: Calculate the moles of KHP

The molar mass of KHP (\(C_8H_5KO_4\)) is \(M=(8\times12.01 + 5\times1.01+39.10 + 4\times16.00)\space g/mol=204.23\space g/mol\).
The moles of KHP, \(n=\frac{m}{M}\), where \(m = 1.900\space g\) and \(M = 204.23\space g/mol\).
\(n=\frac{1.900\space g}{204.23\space g/mol}\approx0.009303\space mol\)

Step2: Determine the volume of NaOH

The volume of NaOH, \(V = 29.35\space mL=29.35\times10^{- 3}\space L\)

Step3: Calculate the concentration of NaOH

The reaction between KHP (\(C_8H_5KO_4\)) and NaOH (\(NaOH\)) is \(C_8H_5KO_4+NaOH
ightarrow C_8H_4KNaO_4 + H_2O\), and the mole ratio of KHP to NaOH is \(1:1\).
The concentration of NaOH, \(C=\frac{n}{V}\), where \(n = 0.009303\space mol\) and \(V=29.35\times 10^{-3}\space L\)
\(C=\frac{0.009303\space mol}{29.35\times10^{-3}\space L}\approx0.317\space M\)

Answer:

\(0.317\space M\)