Question

1. Calculate the concentration of hydronium ion of both buffer solutions at their starting pHs. Calculate the moles of hydronium ion present in 20.0 mL of each buffer. 2. A change of pH by 1 unit means a change in hydronium ion concentration by a factor of 10. Calculate the number of moles of NaOH that would theoretically be needed to decrease the moles of hydronium you calculated in

Answer 1

To calculate the concentration of hydronium ion and the moles in a buffer solution, use the formula [H3O+] = 10^(-pH) and Moles = Concentration x Volume.

Step-by-step explanation:

The concentration of hydronium ion can be calculated using the formula:

[H3O+] = 10^(-pH)

For example, if the starting pH is 4.74, then the concentration of hydronium ion is 10^(-4.74) M

The moles of hydronium ion present in 20.0 mL of the buffer can be calculated using the formula:

Moles = Concentration x Volume

Assuming the concentration of hydronium ion is 10^(-4.74) M, then the moles of hydronium ion in 20.0 mL is (10^(-4.74) M) x (20.0 mL / 1000) L.