Question:
The variation of pH during the titration of 0.5 N Na2CO3 against 0.5 N HCl is shown in the following graph:
The variation of pH during the titration of 0.5 N Na2CO3 against 0.5 N HCl is shown in the following graph:
Updated On: Jan 8, 2024
- (A) a, b and d
- (B) a, c and d
- (C) a, b and c
- (D) b, c and d
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The Correct Option is C
Solution and Explanation
Explanation:
The first end point is observed in the pH range of 10 to 7.9 and can be detected using cresolpthalein, which shows a colour change (in this case, red to colourless) in the pH range of 8.2 to 9.8.Since, bromothymol shows the colour change in the pH range of 6.0 to 7.6, the end point will also be the equivalence point.The second point of inflection is observed in the pH range of 6.1 to 4.0 and can be detected with bromocresol red, which shows a colour change in the pH range of 4.2 to 6.3.Hence, statements a, b and c are correct.
The first end point is observed in the pH range of 10 to 7.9 and can be detected using cresolpthalein, which shows a colour change (in this case, red to colourless) in the pH range of 8.2 to 9.8.Since, bromothymol shows the colour change in the pH range of 6.0 to 7.6, the end point will also be the equivalence point.The second point of inflection is observed in the pH range of 6.1 to 4.0 and can be detected with bromocresol red, which shows a colour change in the pH range of 4.2 to 6.3.Hence, statements a, b and c are correct.
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