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Chemistry Forums for Students => High School Chemistry Forum => Topic started by: IBM on September 08, 2018, 01:38:23 PM

Title: How do I get H2O and NaHSO4 from the reaction below?
Post by: IBM on September 08, 2018, 01:38:23 PM

I have two questions from the equation below
NaOH + H2SO4 = NaHSO4 + H2O
1. How do I get H2O?
If I split NaOH, I get Na+ and OH-, OH- ion from NaOH and H+ ion from H2SO4 combine to form H2O?

2. Why Na+ combined to HSO4 to form NaHSO4 because H+ and SO4- combined to form a neutral compound so there is no need for an extra proton. So why Na+ is combined to HSO4? Could you please explain?

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: chenbeier on September 08, 2018, 02:45:48 PM

You already figuerd out that you get OH- from NaOH and H+ from H2SO4 this will recombine to H2O

So Na+ is left and from H2SO4 there is still HSO4- left. This will get NaHSO4.

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: kavin011 on September 08, 2018, 03:22:22 PM

1) yes. 2) This reaction is called double displacement as well as neautralization reaction.double displacement reaction is switching the charges,in Na+OH- ,Na+ is combine with HSO4- and H+ is combine with OH-.

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: IBM on September 09, 2018, 01:09:14 AM

Quote from: chenbeier on September 08, 2018, 02:45:48 PM

You already figured out that you get OH- from NaOH and H+ from H2SO4 this will recombine to H2O

So Na+ is left and from H2SO4 there is still HSO4- left. This will get NaHSO4.

Do you You mean to say If I split H2SO4, we get 2H+ + SO4²⁻, and one H+ combined to form HSO4⁻. After that  Na+ from NaOH combined to HSO4⁻ and form a neutral compound NaHSO4 and OH- from NaOH combined to another H+ from H2SO4 to form H2O? Please let me clarify.

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: kavin011 on September 09, 2018, 02:17:11 AM

You can write H2SO4 as H & HSO4,this H+ ion is combine with OH- to form H2O and Na+ ion is combine with HSO4 to form NaHSO4.Mentioned 2 reactant is switched their charges with other reactant ,which is called double displacement reaction.

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: chenbeier on September 09, 2018, 06:29:17 AM

Quote from: IBM on September 09, 2018, 01:09:14 AM

Quote from: chenbeier on September 08, 2018, 02:45:48 PM

You already figured out that you get OH- from NaOH and H+ from H2SO4 this will recombine to H2O

So Na+ is left and from H2SO4 there is still HSO4- left. This will get NaHSO4.

Do you You mean to say If I split H2SO4, we get 2H+ + SO4²⁻, and one H+ combined to form HSO4⁻. After that  Na+ from NaOH combined to HSO4⁻ and form a neutral compound NaHSO4 and OH- from NaOH combined to another H+ from H2SO4 to form H2O? Please let me clarify.

Sulfuric acid has two dissoziation reactions.

1. H₂SO₄ => H⁺ + HSO₄^-
2. HSO₄^- =>  H⁺ + SO₄^2-

If you add NaOH the first reaction takes place. After the first H⁺ is neutralized, the second reaction takes place.

I your case there is not enough NaOH so you have only the first reaction.

Title: Re: How do I get H2O and NaHSO4 from the reaction below?
Post by: IBM on September 10, 2018, 02:49:24 AM

Thanks a lot.