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Finding the basicity of an acid:

The concentration of the unknown acid must be the same as that of the base.

You will need:

1 polystyrene cup

2 250ml beaker

1 laboratory thermometer

The unknown acid (aq.) with the same concentration as NaOH

NaOH (aq.)

Steps:

1. Mix an equal volume of the base, using NaOH (aq.) and the unknown acid, both of equal concentration. (e.g. 50 cm3 NaOH and 50 cm3 unknown acid; total volume of water is 100 cm3).

2. Measure and record the highest temperature change using the laboratory thermometer.

3. Next, you need to mix another volume of NaOH (aq.) and half the volume as NaOH of the unknown acid. (e.g. 50 cm3 NaOH and 25 cm3 unknown acid). Since total volume of water in step 3 is only 75 cm3, have to add 25 cm3 to make the total volume of water 100 cm3 so as to make both volumes of water used the same. So have to add 25cm3 to either NaOH or the unknown acid before mixing them.

4. Repeat step 2.

5. If the temperature rise of both is the same, then the unknown acid is dibasic. If the temperature rise of one is half of the one, then the unknown acid is monobasic.

Yep, this is what I got from my senior, hope it's correct!

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13y ago

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