[benworld128]

How many mL of titrant is needed to titrate 45 mL of .75M NaOH if you are titrating with .025M HCl?

My Work Through:

Equation: Naoh + HCl - > NaCL + H20

1.) I found mol of Naoh

.75 mol Naoh * 0.045 L of Naoh = 0.03375 mol Naoh

2.) I do mol to mol ratio of hcl

0.03375 mol Naoh * 1 mol HCl * 1 L HCL / 1 mol Naoh * .025 mol HCL = 1.35 L

1.35 L * 1000 ML = 1350 ML..

I dont think that is right.

Should I bee using M1 * V1 = M2 * V2 ?

[sjb]

How many mL of titrant is needed to titrate 45 mL of .75M NaOH if you are titrating with .025M HCl?

My Work Through:

Equation: Naoh + HCl - > NaCL + H20

1.) I found mol of Naoh

.75 mol Naoh * 0.045 L of Naoh = 0.03375 mol Naoh

2.) I do mol to mol ratio of hcl

0.03375 mol Naoh * 1 mol HCl * 1 L HCL / 1 mol Naoh * .025 mol HCL = 1.35 L

1.35 L * 1000 ML = 1350 ML..

I dont think that is right.

Should I bee using M1 * V1 = M2 * V2 ?

How would your working differ if you were using M1 * V1 = M2 * V2 ?

[benworld128]

True That. It would still come out with the same answer.

So does my answer seem reasonable and correct ?

[sjb]

True That. It would still come out with the same answer.

So does my answer seem reasonable and correct ?

Well, more or less. The acid is diluted 1:30 with respect to the base, so for equimolar quantities you need 30 x the volume of acid compared to base.

I'd be careful what you're writing though, as 1 litre is not the same as 1000 ML (look into SI prefixes), and compare the difference between e.g. Polish and polish.

[benworld128]

1 L = 1000 ML

1 ML = 0.001 L

So whats the problem ?

[sjb]

1 L = 1000 ML

1 ML = 0.001 L

So whats the problem ?

M is not the same as m. One means one million times, the other a thousandth. See e.g. http://en.wikipedia.org/w/index.php?title=SI_prefix&oldid=453831846. A factor of some 10⁹ difference.