Chemistry a level question

how do i solve this
25 cm³ of a 0.1 moldm³ solution of an acid H.A reacts with 75cm³ of a 0.1 moldm³ solution of NaOH What is the value of x?
Equation: HxA + NaOH → + NaxA + XH₂O
Answer X=3

Reply 1

Nitrotoluene

Original post by well-educated-am

how do i solve this
25 cm³ of a 0.1 moldm³ solution of an acid H.A reacts with 75cm³ of a 0.1 moldm³ solution of NaOH What is the value of x?
Equation: HxA + NaOH → + NaxA + XH₂O
Answer X=3

The rule of the house is that you have to try before we make any suggestions.
I am waiting with patience.

Reply 2

anonymous56754

Original post by well-educated-am

how do i solve this
25 cm³ of a 0.1 moldm³ solution of an acid H.A reacts with 75cm³ of a 0.1 moldm³ solution of NaOH What is the value of x?
Equation: HxA + NaOH → + NaxA + XH₂O
Answer X=3

Whenever you get these types of questions, it’s useful to start by calculating the number of moles of each substance, does that help you?

(edited 2 months ago)

Reply 3

Nitrotoluene

Original post by anonymous56754

Whenever you get these types of questions, it’s useful to start by calculating the number of moles of each substance, does that help you?

Yes, the right way to handle such problems.

Please let us know your attempt.

I'm here to help you practice. If you're sharing your work, I'll give you little hints to keep you going. If you're still stuck, I can give you more detailed help. Just let me know which part is confusing you.
EDIT:

Calculate the moles of each reactant

For the acid HxA

For NaOH

Analyze the stoichiometry of the reaction and find stoichiometric ratio between HxA and NaOH

Set up the stoichiometric ratio to solve for x

Talk to you soon!

Sandro

(edited 2 months ago)

Reply 4

awchemtutor

This is a limiting reagent problem.
a) Find the mole of each reactant.
b) Determine the limiting reagent.
c) Apply the stoichiometry relationship.

Reply 5

Nitrotoluene

Original post by awchemtutor

This is a limiting reagent problem.
a) Find the mole of each reactant.
b) Determine the limiting reagent.
c) Apply the stoichiometry relationship.

Hello awchemtutor!
I apologise for this intrusion, but in my humble opinion the problem can be solved without identifying the limiting reagent.
The problem text does not ask you to identify the limiting reagent. Doesn't it?
Kind regards,
Sandro

Reply 6

Pigster

Original post by Nitrotoluene

It would have been better if the Q were clearer, e.g. 25 cm³ ... of H.A reacts "exactly" with...

But you're right, it isn't a limiting reagent Q. The only way you can solve the problem is to assume that neither is in excess.

Reply 7

awchemtutor

Original post by Nitrotoluene

True. But it is a good idea for students to learn that if amounts are given for the reactants, to determine the limiting reagent. Just in case, equation is not a 1:1 ratio.
I agree in this case, it is straight forward and the limiting reagent is clear to see.