QUESTION 42 Buffer preparation: A 6.90 g sample of sodium nitrite (NaNO2. 68.995) was dissolved in about 100 mL of water. To this was added 500 ml of 0.200 M nitrous acid (HNO₂. pkg = 3.34) and the total volume was brought to 1.00 L by adding distilled water. (hint calculate the molarites of the two buffer components first) Addition of a strong base to the buffer: To the entire solution of this buffer solution was added 0.056 mol KOH (s). There is no detetable change in volume as a result of this additoin The pH of the buffer +KOH solution is Write down your work to upload in the following "File Response" question.

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QUESTION 42
2
Buffer preparation:
A6.90 g sample of sodium nitrite (NaNO₂, 68.995) was dissolved in about 100 mL of water. To this was added 500. mL of 0.200 M nitrous acid (HNO2. pKg = 3.34) and the total volume was
brought to 1.00 L by adding distilled water.
(hint calculate the molarites of the two buffer components first)
Addition of a strong base to the buffer:
@
To the entire solution of this buffer solution was added 0.056 mol KOH (s). There is no detetable change in volume as a result of this additoin
The pH of the buffer + KOH solution is
Write down your work to upload in the following "File Response" question.
E
Click Save and Submit to save and submit. Click Save All Answers to save all answers.
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Transcribed Image Text:QUESTION 42 2 Buffer preparation: A6.90 g sample of sodium nitrite (NaNO₂, 68.995) was dissolved in about 100 mL of water. To this was added 500. mL of 0.200 M nitrous acid (HNO2. pKg = 3.34) and the total volume was brought to 1.00 L by adding distilled water. (hint calculate the molarites of the two buffer components first) Addition of a strong base to the buffer: @ To the entire solution of this buffer solution was added 0.056 mol KOH (s). There is no detetable change in volume as a result of this additoin The pH of the buffer + KOH solution is Write down your work to upload in the following "File Response" question. E Click Save and Submit to save and submit. Click Save All Answers to save all answers. W S alt X # #M 3 E D с SA+ $ 4 R TI % 5 V T a G 6 B Y H & 7 ly 7 U N ★ 8 00 4 J 8 1. 1 SP M ( fio. 9 5 num lk K O 9 2 O V 11 (1) A O 6 L alt P 3 - V .... O { 11 + [ 11 ?
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