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A student investigated the change in pH when potassium hydroxide solution is added to 25 cm3 of dilute nitric acid.

They plotted their results on a graph, represented by the data in the table below.

Figure 1

Volume of potassium hydroxide added (cm3\text{cm}^3cm3)pH
0.02.0
5.02.1
10.02.3
15.02.7
20.07.0
25.011.3
30.012.0

A line graph representing the pH curve. The vertical y-axis is labelled 'pH' from 0 to 14. The horizontal x-axis is labelled 'Volume of potassium hydroxide added (cm³)' from 0 to 30. The curve starts at pH 2.0 at 0 cm³, rises very gradually to pH 2.7 at 15 cm³, goes up almost vertically through pH 7.0 at 20 cm³, and flattens out to pH 12.0 at 30 cm³.

Using Figure 1, give the pH of the nitric acid at the start of the experiment.

[1]

Acids Questions

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