IB DP Chemistry: SL復(fù)習(xí)筆記8.2.6 pH Meters & Universal Indicator

Category: IB課程, 教材筆記, 福利干貨 Date: 2022年8月4日下午4:07

pH Meters & Universal Indicator

The most?accurate?way to determine the pH is by reading it off a?pH meter
The pH meter is connected to the?pH electrode?which shows the pH value of the solution

1.7-Equilibria-pH-Meter

The diagram shows a digital pH meter that measures the pH of a solution using a pH electrode

A less accurate method is to measure the pH using universal indicator paper
The universal indicator paper is dipped into a solution of acid upon which the paper changes colour
The colour is then compared to those on a chart which shows the colours corresponding to different pH values

1.7-Equilibria-Universal-Indicator-Paper

The diagram shows the change in colour of the universal indicator paper when dipped in a strong (HCl) and weak (CH₃COOH) acid. The colour chart is used to read off the corresponding pH values which are between 1-2 for HCl and 3-4 for CH₃COOH

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