1. A bottle of inexpensive white wine has a pH of 2.85. a) What color will the i

Question

1. A bottle of inexpensive white wine has a pH of 2.85.

a) What color will the indicator phenolphthalein display when added to the white wine?

b) What is the hydronium ion concentration, [H3O + ], of the white wine?

c) Is the white wine acidic or basic?

2. A solution of 0.100 M HCI contains phenolphthalein indicator and is colorless. A solution of 0.100 M NaOH contains phenolphthalein indicator and is pink in color. What will the color be if equal volumes of the two solutions containing the indicators are mixed?

Please anwer all parts of the question. THANK YOU!!

Explanation / Answer

1.

a) The phenolphthalein indicator will show no colour in the pH range of 2.85.

b) Strong Acidic range of pH = 2.85 implies most of the concentration of the hydronium ion is due to H+ dissociation

[H3O+] = exp(-2.85) = 0.057M

c) It is acidic.

2.

Phenolphthalein works in the pH range of 8.2 to 10 since it itself is a weak acid and starts to dissociate in slightly alkaline conditions. When equal volumes of 0.1M HCl and NaOH are mixed the pink colour of the indicator with the NaOH solution will slowly start to fade away and eventually become colourless.

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