Question

What is the molarity of 42 ml of sodium hydroxide titrated to endpoint by 25 ml of 0.2M hydrochloric acid?

Answer 1

I know the formula and everything else, but just need some clarification on my answer! Thanks!

Answer 2

I would just like some clarification on my answer, please

Answer 3

Hey @agent0smith do you happen to know anything about this subject, or could perhaps tell me if my answer is somewhat correct?

Answer 4

I have a formula or process, and would like to know if it is correct

Answer 5

As a final answer I got .11M

Answer 6

I believe you are correct @mathimatician

Answer 7

I am?

Answer 8

I believe so, are you supprised?

Answer 9

Yeah, a bit

Answer 10

Well you seem right to me :) I would be surprised if you aren't

Answer 11

Could you help me with another problem similar to this one?

Answer 12

Sure :)

Answer 13

Ok! Thank you!

Answer 14

What is the molarity of 14 ml of sodium hydroxide titrated to endpoint by 42 ml of 4N phosphoric acid?

Answer 15

Now this one deals with normality and molarity which is why I got confused...

Answer 16

I got the formula for normality (N = equivalents solute/volume of solution in liters) and the formula for molarity which is just (M = moles/liters)

Answer 17

Ok so is this multiple choice?

Answer 18

No I am afraid not...

Answer 19

Haha excellent :) It makes a wonderful challenge ^^

Answer 20

I know.. Like I think I know how to do it, it's just that the normality portion is getting in the way... :/

Answer 21

Ok, ok, so do what you think is right and then i'll check it k?

Answer 22

Well, I don't really know how to do the normality portion...

Answer 23

Wait... Let me try something out.

Answer 24

Just stick with the molarity after all that is what it is asking for right?

Answer 25

It is asking for the molarity...

Answer 26

Ok. I have a formula (NaVa=NbVb) which stands for (normality of acid and volume of acid and normality of base and volume of base.)

Answer 27

right good

Answer 28

However, I can't use this one because they are looking for a molarity and not a normality as an end result

Answer 29

Exactly :) see they are trying to trick you

Answer 30

Is there a formula that merges the two together?

Answer 31

because I know that there is a solution for the EQ (equivalent solutes) that is MM/#H+ or OH- molecules

Answer 32

Yes :) I think you can figure this out... just think about

Answer 33

it*

Answer 34

Ok, well I know that the molar mass (MM) of the sodium hydroxide is 39.997 g/mol

Answer 35

But I don't know how many H+ or OH- molecules it has

Answer 36

Could you help me figure that bit out?

Answer 37

Yes lemme look at soemthing

Answer 38

Ok

Answer 39

I am honestly just going to try some more tomorrow! Thanks for all your help though!