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Gemiola [76]
3 years ago
11

45 Three samples of the same solution are tested, each with a different indicator. All three indicators, bromthymol blue, bromcr

esol green, and thymol blue, appear blue if the pH of the solution is
(1) 4.7 (2) 6.0 (3) 7.8 (4) 9.9
Chemistry
2 answers:
zalisa [80]3 years ago
6 0
(4) 9.9 is the most sensible answer.

When an indicator appears blue, that means the solution is basic and the pH of the solution should be within the range of 8 and 14.

Hope this helps~


ANEK [815]3 years ago
3 0

<u>Answer:</u> The correct answer is Option 4.

<u>Explanation:</u>

Bromothymol blue, Bromocresol green and Thymol blue are the indicators which change their color according to the change in pH of the solution.

The pH range and color change of these indicators are:

  1. Bromothymol Blue: The pH range for this indicator is 6.0 to 7.5 and color change is from yellow to blue. It appears yellow below pH 6.0 and blue above pH 7.5
  2. Bromocresol green: The pH range for this indicator is 3.5 to 6.0 and color change is from yellow to blue. It appears yellow below pH 3.5 and blue above pH 6.0
  3. Thymol Blue: The pH range for this indicator is 8.0 to 9.6 and color change is from yellow to blue. It appears yellow below pH 8.0 and blue above pH 9.6

As, the highest pH of all the indicators is 9.6, so every indicator will appear blue above pH 9.6.

Hence, the correct answer is Option 4.

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<u>Given information:</u>

Concentration of HCl = 0.035 M

<u>To determine:</u>

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<u>Explanation:</u>

Hydrochloric acid, HCl is a strong acid. It will completely dissociate to give H+ and Cl- ions

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Hence the concentration of H+ = Cl- = 0.035M

Now, pH measures the strength of H+ ions in a given solution. It is expressed as:

pH = -log[H+]

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Explanation:

According to the given data, we will calculate the following.

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Rate constant for first order reaction is as follows.

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Therefore, time taken will be calculated as follows.

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