Part 3: Preparing and testing the carbonic acid/bicarbonate buffer 3) and 6) Buffer 0.1 MHCI A:...

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Part 3: Preparing and testing the carbonic acid/bicarbonate buffer 3) and 6) Buffer 0.1 MHCI A: Buffer A: Buffer

B: Butter B: Buffer Part 4: Testing water for pH resistance 2) and 5) DFDFDF A: HO B: H0 Parts 3 and 4. 5) Write a balanced equation for the reaction that occurred when HCl was added to the buffer. (The reactants a

Parts 3 and 4. 6) Write a balanced equation for the reaction that occurred when NaOH was added to the buffer. (The reactants

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Answer 1

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Answer :

Buffer contain H2CO3 and HCO3 - species .

(5) Balanced Reaction when HCl was added to the buffer

Carbonic acid being acid will not react with HCl , however bicarbonate ion react with HCl to produce more carbonic acid which decreases the pH .

HCO3 - (aq) + HCl -----> H2 CO3 (aq) + Cl- (aq)

(6) : Balanced Reaction when NaOH is added to the buffer

Carbonic acid will react with OH- ions produced by NaOH , to form bicarbonate ion which are basic in nature and increase pH of the system

H2 CO3 (aq) + OH- (aq) ----> HCO3 - (aq) + H2O

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