10. The pH at the equivalence point of a titration of a weak acid with a strong

Question

10. The pH at the equivalence point of a titration of a weak acid with a strong base will be a. less than 7.00 b. equal to 7.00 c. greater than 7.00 d. equal to the pK, of the acid e. more data needed to answer this question 11. Methyl orange is an indicator with a K, of 1 x 10 . Its acid form, Hin, is red, while its base form, In", is yellow. At pH 6.0, the indicator will be a. red b. orange c. yellow d. blue e. not enough information 12. If 25.0 mL of 0.451 M NaOH solution is titrated with 0.253 M H2SO, the flask at the endpoint will contain (besides the indicator phenolphthalein) as the principal components: a. sodium hydroxide, sulfuric acid, and water b. dissolved sodium sulfate and water c. sodium hydroxide, sodium sulfate, and water d. dissolved sodium sulfate, sulfuric acid, and water

Explanation / Answer

10)

Since the base is strong, at equivalence point pH will be more than 7

Answer: c

11)

we have below equation to be used:

pKa = -log Ka

= -log (1*10^-4)

= 4

So, for pH less than 4, it will be acidic form and it will be res

For pH greater than 4, it will be yellow

Answer: c

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