30 wn concentration requires solution. What is the concentration of the diprotic

Question

30 wn concentration requires solution. What is the concentration of the diprotic acid 4. The titration of 10.00 mL of a diprotic acid solution of unkno 21.37 mL of a 0.1432 M NaOH solution? the concentra mL of vinegar (mass- 10.05 g) requires 14.77 mL of 0.4926 M NaOH to reach the end point. Calculate the molarity and mass percent of the acetic acid in the vinegar. 5. A 0.2602 g sample of an unknown monoprotic acid requires 12.23 mL of0.1298 M NaOH solution to reach the end point. What is the molecular mass of the acid? 6.

Explanation / Answer

4)

Balanced chemical equation is:

2 NaOH + H2A ---> Na2A + 2 H2O

Here:

M(NaOH)=0.1432 M

V(NaOH)=21.37 mL

V(H2A)=10.0 mL

According to balanced reaction:

1*number of mol of NaOH =2*number of mol of H2A

1*M(NaOH)*V(NaOH) =2*M(H2A)*V(H2A)

1*0.1432*21.37 = 2*M(H2A)*10.0

M(H2A) = 0.153 M

Answer: 0.153 M

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