Acid-base indicators - explore some of the properties of selected acid-base indicators and measure the pH of some common solutions.

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Results:

Questions:

Which of the above indicators could you choose to test the pH of a solution of (a) pH = 3, (b) pH= 6, (c) pH =9? You could use the universal indicator as in the tests taken out these three results were shown so this indicator pointed out that these results can be found as was in vinegar, pure water and NaOH.

How might you measure the exact pH at which a particular indicator changes colour? You could measure this with a colour indicator that shows particular colours and what their pH is when this colour change takes place.

Which indicator or indicators is or are able to distinguish between the two acids?

Method: (part B)

1. In this part of the practical you will use universal indicator and it colour chart to measure the pH of some common household substances. If you have time you could also test these substances with other indicators.

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Questions: -

Can you draw any conclusions from the pH of a solution and some of its properties or uses? Explain. Some substances used around the household such as cleaning products (ammonia, limewater etc.) are very high in acidity, which means that certain cleaning products must be high in acid to clean. Beverages are a lot lower in and means that are more base type solutions, which are more suitable for consuming.

Why is universal indicator more useful for this second exercise? As we know the colours in which that they change to with the universal indicator as to their pH level

Conclusion:

In conclusion from this practical we can see that from using different substances to test certain products for the pH level. We have found how certain things we use everyday have different levels of pH and that we can see why they are used for this purpose and why they are made for this purpose.