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chemistry practical question

What experiments other than a titration can you use for finding the concentration of an acid or alkali?
Any replies will be appreciated :smile:

thanks

Reply 1

elpaw

wouldn't measuring the pH give you the concentration of H+, which should in theory give you the concentration of the acid/alkali?

Reply 2

Ben.S.

elpaw

wouldn't measuring the pH give you the concentration of H+, which should in theory give you the concentration of the acid/alkali?

You would need to know the (p)Ka for that.

Ben

Reply 3

cobra

Adding a strong base and measuring the amount of gas collected?

Reply 4

qqqwwweee

adding a reactive metal e.g. Zn, carbonate, or hydrogencarbonate in excess and measuring the volume of the gaseous product

Reply 5

elpaw

what if its an alkali?

Reply 6

qqqwwweee

elpaw

what if its an alkali?

add an excessive known amount of a strong acid and then find the concentration of the acidic solution :biggrin:

Reply 7

Heidi

keisiuho

adding a reactive metal e.g. Zn, carbonate, or hydrogencarbonate in excess and measuring the volume of the gaseous product

Hi Keisiuho,
could u please explain me the procedure you'd have to follow for measuring the volume of the gas?
Thanks so much.

Reply 8

qqqwwweee

Heidi

Hi Keisiuho,
could u please explain me the procedure you'd have to follow for measuring the volume of the gas?
Thanks so much.

Connect a closed side-arm flask to a gas syringe and then measure the volume. It is of course not an accurate methode as the gas may leak before you "close" the system and some reactants may not be reacted completely.

Reply 9

vortex_199

Using universal indicator, is a good way to find out if asubstance is an acid or alkaline.

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