Measuring pH Flashcards

1️⃣ Familiarise yourself with the flashcards:

Look through all the flashcards to see what's on both sides.
Make sure you understand the information on each card. If something's unclear, click the link to the revision notes at the bottom of the page for more details.

2️⃣ Test yourself:

Look at the question or prompt on each card and try to remember the answer before flipping it over.
Check the answer and make a note of any cards you find challenging and need to go over more.

3️⃣ Consistently Review and Practice:

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Note: We may include questions that have multiple correct answers. It's useful to remember specific examples to understand these concepts better.

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What does pH tell you about a solution?

pH tells you how acidic or how alkaline a solution is.

A neutral solution has a pH of 7.

You can use universal indicator (or pH paper) or a digital pH probe (pH meter).

Add a few drops of universal indicator to the solution, then match the colour to a pH chart to find the pH value.

Dip a strip of pH paper into the solution, remove it, then compare its colour to the pH colour chart.

Universal indicator shows many colours and gives a pH value, but litmus only shows if a solution is acidic or alkaline.

In school labs the pH scale usually runs from 0 (very strong acid) to 14 (very strong alkali).

Rinse the probe with water, place it in the solution, wait for the reading to settle, then read the pH value on the display.

A pH probe gives a precise number on a screen, so it does not depend on judging colours by eye.

You rinse the probe to remove the old solution so it does not mix with the next one and change the pH reading.