What would be the colour of litmus in a solution of sodium carbonate ?

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Solution

We know that sodium carbonate is a basic salt. Hence, its aqueous solution will also be basic in nature. Since acids turn blue litmus red while bases turn red litmus blue, therefore when red litmus paper is dipped in sodium carbonate solution it will change to blue colour. Blue limus paper, however will not show any colour change and will exhibit blue colour only.

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Question:

(a) A solution has a pH of 7. Explain how you would :

(i) increase ist pH; (ii) decrease its pH;

(b) If a solution changes the colour of litmus from red to blue, what can you say about its pH?

What is observed when neutral litmus solution is added to sodium hydrogen carbonate solution?

N a_{2} C O_{3}

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