1 A reduction of one pH unit changes the concentration of H3O+ by how much? \" Q

Question

1 A reduction of one pH unit changes the concentration of H3O+ by how much? " Question 3 10 out of 10 points If a solution is made acidic and a turmeric indicator is used, what color best describes the color of the indicator under that condition? "

2 If an aqueous solution of acetic acid is titrated to its equivalence point (not end point) with a solution of sodium hydroxide which of the following will best describe the pH of the resulting solution? "

3 If an aqueous solution of hydrochloric acid is titrated to its equivalence point (not end point) with a solution of sodium hydroxide which of the following will best describe the pH of the resulting solution? "

4 An aqueous solution of acetic acid is titrated with an aqueous solution of sodium hydroxide to the half-equivalence point. The value of the pH of the solution is best described by which of the following? "

5 Are the equivalence point and endpoint the same thing? "

6 Turmeric indicator changes color at a pH of around 8.6. If you are using turmeric to determine the endpoint for the titration of a strong acid with a strong base, which situation will you have? "

7 A 0.1 M solution of ________ has a pH of 7.0. "

8 What is the pH of an aqueous solution at 25.0 °C that contains 3.98 × 10-9 M hydroxide ion?

Explanation / Answer

Let us consider the initial pH to be x.

So, the concentration of H3O+ initially was= [H3O+] = 10-pH = 10-x

Now, after the pH is changed by one unit less, the pH become (x-1).

So, the final concentration of H3O+ becomes= [H3O+] = 10-pH = 10-(x-1)

Therefore, (Initial concentration)/(final concentration) = (10(x-1))/ (10x)= 1/10.

Hence, the final concentration of H3O+ is 10 times that of the initial concentration.

Part 2:

If a solution is acidic, and turmeric indicator is used, then, the colour of the turmeric solution remains yellow.

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