Urgent help needed (1 Viewer)

[leesh95]

For our prac exam we are titrating NaOH with oxalic acid. This will then be used to titrate acetic acid.

According to the steps our teacher gave us each student had to make a NaOh solution by mixing 2g of NaOH in 500 mL water. This is then titrated.

Unfortunately when I was doing my prac I spilled a lot of my NaOH solution. I have only done one titration with oxalic acid and I don't think I have enough solution left.

The problem is that the if I make a new NaOH solution I won't have enough time to standardize it.

Is it possible that I dilute my NaOH solution with water to increase it's volume and then titrate it with oxalic acid. Will doing this affect my titration result of acetic acid?

 

[leesh95]

Need urgent chem help

For our prac exam we are titrating NaOH with oxalic acid. This will then be used to titrate acetic acid.

According to the steps our teacher gave us each student had to make a NaOh solution by mixing 2g of NaOH in 500 mL water. This is then titrated.

Unfortunately when I was doing my prac I spilled a lot of my NaOH solution. I have only done one titration with oxalic acid and I don't think I have enough solution left.

Is it possible that I dilute my NaOH solution with water to increase it's volume and then titrate it with oxalic acid. Will doing this affect my titration result of acetic acid?

 

[Immortalp00n]

Re: Need urgent chem help

i think u will need to make up another solution
coz now ur solution isnt a solution of 2g NaOH and 500ml distilled water

its possibly 1g NaOH and 300 mL distilled water, so u will get messed up results.
and u cant just refill it with water coz then it will decrease in concentration due to the loss of NaOH

TLDR, gotta make a new standard solution

 

[leesh95]

Re: Need urgent chem help

No the NaOH wasn't a standard solution. It had to be standardized by titrating with Oxalic acid standard solution. Then when we found out the concentration of NaOH we use it to titrate acetic acid.

So adding water to NaOH and fiding new concentration by titration won't work?

 

[golgo13]

Re: Need urgent chem help

It could but it'd be a lot more work than just to make another set of NaOH solution and then to standardise that, because ur gonna need quite a bit of it for the acetic acid if i'm reading it correctly

 

[leesh95]

Re: Need urgent chem help

Well I have about 200 mL now so if I add another 200 I would probably get 400 mL.

You only need 20 mL for titrating with oxalic acid but the NaOH is then used to titrate acetic acid. I'm afraid I won't have enough solution of NaOH left to titrate acetic acid.

 

[Immortalp00n]

Re: Need urgent chem help

No the NaOH wasn't a standard solution. It had to be standardized by titrating with Oxalic acid standard solution. Then when we found out the concentration of NaOH we use it to titrate acetic acid.

So adding water to NaOH and fiding new concentration by titration won't work?

ohhh i see
and even then i dont think it'll work ( btw this water u r referring to must be distilled( minimal impurities and shit) u know yeh)

 

[leesh95]

Re: Need urgent chem help

ohhh i see
and even then i dont think it'll work ( btw this water u r referring to must be distilled( minimal impurities and shit) u know yeh)

Can I ask why?

 

[leesh95]

Re: Need urgent chem help

Also it's not NaOH concentration we get marked on it's how accurate our acetic acid results are.

 

[someth1ng]

I'm assuming your oxalic acid solution is the primary standard.

Technically, you CAN do that but note that titration revolved around the number of moles that react. If you dilute too much, you might only be able to titrate against a tiny sample of acetic acid, making it inaccurate since measuring errors will become more significant.

 

[leesh95]

How much dilution is too much dilution?

 

[golgo13]

I wouldn't go anything below 0.05Molar