Sodium Hydroxide is a chemical that is found in drain cleaners and as a componen

Question

Sodium Hydroxide is a chemical that is found in drain cleaners and as a component of soaps. Is Sodium hydroxide an acid or a base? Using the information below and the table provided, estimate the pH of a 1 M solution of sodium bisulfate (NaHSO_4). When phenolpthalein is added to 1 M NaHSO_4 the resulting solution is colorless. When thymol blue is added to 1 M NaHSO_4 the resulting solution is yellow. When methyl violet is added to 1 M NaHSO_4 the resulting solution is violet. Which of the indicators in the table above would be the best to use if you wanted to observe changes in a solution at around pH 7? If you added Thymol blue to a solution of pH 5 what color would you observe?

Explanation / Answer

1) According to Arrhenius concept base is a substance which can doante hydroxide ion (OH-) in aquesous medium is classified as a base. Since Sodium Hydroxide (NaOH ) is a hydroxide ion donor, it act as a base.

NaOH(aq) = Na+(aq) + OH-(aq)

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