A.) What are the similarities and differences between the data in Data Table 3 a

Question

A.) What are the similarities and differences between the data in Data Table 3 and 4? Explain how the data supports the role of the buffer.

B.) Could you please explain to me why the pH in data table 3 decreased as the drop number increased and why the pH in data table 4 increased as the drop number increased. Thank you so much!!!

Data Table 3: Adding 6M HCl from Data Table 4: Adding 6M NaOH the Pipet into Well B1 pH of Solution Drop Number P of SolutionDrop Number pH of Solution Drop Number 5.8 5.6 5.4 5.0 4.5 6.2 6.4 6.6 6.8 7.2 4 4

Explanation / Answer

B1 or buffer 1 shows an decrease in pH of the solution as strong acid 6M Cl is added, as pH is the measure of the hydronium concentration ,[H3O+]

pH=-log[H3O+]

,so in B1 [H3O+] is increasing

B67 or buffer 6 shows an increase in pH of the solution as strong base 6M NaOH is added, as pH is the measure of the hydronium concentration ,[H3O+]

pH=-log[H3O+]

,so in B6 [H3O+] is decreasing

B)As mentioned above pH=-log[H3O+], so as H3O+ increases in solution pH decreases.

HCl+H2O=H3O+ +Cl-

HCl or strong acid increases [H3O+] after its complete dissociation

so pH decreases

while strong base like NaOH=Na+ +OH- increases OH- in the solution which further reacts with H3O+ in the solution and decreases its amount, thereby increasing pH

OH- +H3O+=2H2O

,

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