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Topic: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?  (Read 1179 times)

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Offline sharbeldam

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How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants in this table?

I looked up every reaction online, nothing helps!! please give me a hint.

we can only use our eyes to know the difference between the two colorless tubes using these reactants in table.

for instance if i use bacl2 , they will both form white percipitate which doesnt help...etc.
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Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #1 on: September 27, 2020, 11:30:58 AM »
What do you know about to detect sulfates?

You found BaCl2. Great. So you know  both are sulfates.

What does it mean if a salt contain hydrogenatoms regarding pH?
Which of the substances could be used if something is acidic?

Answer this questions, by the way we do not solve homeworks, without your own atempt.

Offline sharbeldam

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #2 on: September 27, 2020, 11:33:20 AM »
they both contain sulfates tho so bacl2 wont work as i mentioned. This is not homework sir, i know the site rules, Im trying to help someone solving this question, i gave my try for the first reactant, i tried to see the products of them all.

I dont want you to solve anything for me, thanks
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Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #3 on: September 27, 2020, 11:36:22 AM »
I changed a little bit the answer above. But anyway, why the other one dont do the work by him/her self.

Offline sharbeldam

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #4 on: September 27, 2020, 11:38:10 AM »
I dont understand, what is the problem of me helping someone? i spend most of my time helping people and sometimes i get help from this great site.

we can only use eyes, so indicators dont work, for instance if i use NaOH, both solution will stay colorless.
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Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #5 on: September 27, 2020, 11:46:17 AM »
You can use your eyes, there is one substances what change dramatically if you add it, which could it be?

This one is also used in the kitchen.

Offline sharbeldam

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #6 on: September 27, 2020, 11:48:11 AM »
you mentioned in your hint the acidic compound so i think your talking about adding a base, is there another base than NaOH?

kitchen... baking soda?
 i appreciate your help btw.
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Offline AWK

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #7 on: September 27, 2020, 11:50:25 AM »
Compare the acidity constants of carbonic acid with K2 of sulfuric acid.
AWK

Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #8 on: September 27, 2020, 11:53:13 AM »
you mentioned in your hint the acidic compound so i think your talking about adding a base, is there another base than NaOH?

kitchen... baking soda?
 i appreciate your help btw.

NaOH doesnt help because no indicator present.
Yes correct baking soda.. Which one is the baking soda here? Do you know effervescent powder? What happens if you add the compound to the hydrogensulfat.

Offline sharbeldam

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #9 on: September 27, 2020, 11:55:12 AM »
well baking soda is NaHCO3, it should release CO2 with the HSO4? and does nothing with Na2SO4?
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Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #10 on: September 27, 2020, 11:58:55 AM »
Yes correct you will see a lot of bubbles and foam.

Offline sharbeldam

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #11 on: September 27, 2020, 11:59:25 AM »
Thank you :)
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Offline chenbeier

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #12 on: September 27, 2020, 12:07:11 PM »
Compare the acidity constants of carbonic acid with K2 of sulfuric acid.

If I have two tubes with two sulfates, how should it help if I look up the K2 values of carbonic acid and sulfuric acid. If I find them in a table how to go further..

Offline Borek

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #13 on: September 27, 2020, 01:16:02 PM »
we can only use eyes, so indicators dont work

This is a rather strange statement, plenty of pH indicators that work by changing colors. They are not lsited between substances that can be used, but pH strip would be my tool of choice here.

Quote
for instance if i use NaOH, both solution will stay colorless.

NaOH is not an indicator, I am not sure why you mention it here.
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Offline Borek

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Re: How to distinguish between NaHSO4 and Na2SO4 in lab using these reactants?
« Reply #14 on: September 27, 2020, 01:17:23 PM »
If I have two tubes with two sulfates

You don't have two tubes with two sulfates, you have a tube with a sulfate and a tube with hydrogensulfate.
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