What type of chemical reaction is (a) Vinegar in diluted water?

When water is added to vinegar, the vinegar's acidity decreases, which results in a higher number on the pH scale. However, diluting vinegar with water can never make it alkaline, because water itself is not alkaline; the pH of the mixture can't be higher than the higher pH value of the two components.

Explanation: it loses acidity. Diluting it can never make it alkaline and the PH mixture can’t be higher.

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