Advertisement Remove all ads

Explain Why an Aqueous Solution of Sodium Chloride is Neutral but an Aqueous Solution of Sodium Carbonate is Basic (Or Alkaline). Write Chemical Equations of the Reactions Involved. - Science

 Explain why an aqueous solution of sodium chloride is neutral but an aqueous solution of sodium carbonate is basic (or alkaline). Write chemical equations of the reactions involved.

Advertisement Remove all ads

Solution

NaCl(s) + H2O(l) →  NaOH(aq) + HCl(aq)

An aqueous solution of sodium carbonate (washing soda) is alkaline because it is a salt prepared from the reaction of a weak acid, carbonic acid (H2CO3), and a strong base, sodium hydroxide (NaOH). When sodium carbonate is dissolved in water, it gets hydrolysed to some extent and forms sodium hydroxide and carbonic acid.

Na2CO3(s) + 2H2O(l)  →  2NaOH(aq) + H2CO3(aq)

Sodium hydroxide, being a strong base, is fully ionised to give a large amount of hydroxide ions (OH-), and carbonic acid, being a weak acid, is slightly ionised to form a small amount of hydrogen (H+) ions. Therefore, an aqueous solution contains more hydroxide ions than hydrogen ions, and this makes the solution basic.

  Is there an error in this question or solution?
Advertisement Remove all ads

APPEARS IN

Lakhmir Singh Class 10 Chemistry (Science)
Chapter 2 Acids, Bases and Salts
Q 32 | Page 97
Advertisement Remove all ads
Advertisement Remove all ads
Share
Notifications

View all notifications


      Forgot password?
View in app×