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A student added solid magnesium oxide to 50 cm³ of dilute hydrochloric acid and monitored the change in pH. The results are shown in Figure 1.

A titration curve graph showing pH on the y-axis and the mass of magnesium oxide added in grams on the x-axis. The y-axis ranges from 0 to 14 in increments of 1. The x-axis ranges from 0 to 2.0 g with gridlines every 0.1 g. The curve starts at pH 1.0 at 0 g, rises very gradually to about pH 2.0 at 1.0 g, then rises almost vertically from pH 3.0 up to pH 9.0 at exactly 1.2 g of magnesium oxide, before flattening out and leveling off near pH 10.0.

Using Figure 1, give the mass of magnesium oxide required to make a neutral mixture.

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Acids Questions

Practise Edexcel GCSE Chemistry Acids with exam-style questions for Foundation and Higher tier. 100 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.

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