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Chemistry Calculation

1. 25 cm3 of a solutionof sodium hydroxide reacts with 15 cm3 of 0.1 mol/dm3HCl. What is the molar concentration of the sodium hydroxide solution?
Do I work this out similarly to the way I work out titrations?
Reply 1
Avatar for HAnwar
HAnwar
17
Original post by funkymonster
1. 25 cm3 of a solutionof sodium hydroxide reacts with 15 cm3 of 0.1 mol/dm3HCl. What is the molar concentration of the sodium hydroxide solution?
Do I work this out similarly to the way I work out titrations?


Yeah basically.

Find the moles for HCl, work out the ratio of HCl to NaOH (if it's one to one) by writing out the equation, and then when you have your moles divide that by your volume of NaOH and then divide by 1000.
Reply 2
Avatar for Pigster
Pigster
20
Is the NaOH exactly neutralised by the HCl?

In that case the answer is 0 mol dm-3.
Original post by HAnwar
Yeah basically.

Find the moles for HCl, work out the ratio of HCl to NaOH (if it's one to one) by writing out the equation, and then when you have your moles divide that by your volume of NaOH and then divide by 1000.


Got it! Thank you
Reply 4
Avatar for HAnwar
HAnwar
17
Original post by funkymonster
Got it! Thank you


No problem.
If you need to check your answer ask.
Original post by Pigster
Is the NaOH exactly neutralised by the HCl?

In that case the answer is 0 mol dm-3.


Don't think thats right my friend. But, OP i got 1.2!
Reply 6
Avatar for Pigster
Pigster
20
After you've added the acid, the conc. of NaOH will indeed to zero.

At the start it was 0.6 mol dm-3.

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