Question

irt II - Acidification of Water by Carbon Dioxide Describe the effect that blowing into the water had on the pH of the solution. Write the chemical equation that is occurring when you are blowing into the reaction. Part III and IV – Buffer Capacity 7. At what volume does the pH change more than 1 pH from the initial pH when NaOH was added to water, 0.01M buffer and 0.1 M buffer (Part III)? 8. At what volume does the pH change more than 1 pH from the initial pH when HCI was added to water, 0.01 M buffer and 0.1 M buffer (Part IV)? 9. Overall, which solution was the most resistant to a change in pH when either NaOH or HCI was added?

Answer 1

a) blowing into the water will decrease its pH and thus will make it acidic .

b) blowing into the water will release CO2 gas into water which will form Carbonic acid (acidic in nature) and thus carbonic acid will decrease the pH of water towards acidic side (less than 7 )

The chemical equation is is follows ;

H2O(l) + CO2(g) <<<<equilibrium>>>>> H2CO3 (aq)

This H2CO3 is acidic and decreases pH of neutral water .