Calculate the ph of a 1.00 liter buffer solution that contains 0.300 m hc2h3o2 and 0.300 m nac2h3o2. (b) calculate the ph of this solution after 0.020 mol of naoh is added (neglect any volume changes

(a) 4.75; (b) 4.81

Step 1. Write the equation for the equilibrium

HC2H3O2 + H2O ⇌ C2H3O2^(-) + H3O^(+); pKa = 4.75

or

HA + H2O ⇌ A^(-) + H3O^(+)

Step 2. Calculate the pH of the buffer

The Henderson-Hasselbalch equation is

pH = pKa + log([A^(-)]/[HA]) .

pH = 4.75 + log((0.300 mol/L)/(0.300 mol/L)) = 4.75 + log1.00 = 4.75 + 0

= 4 .75

Step 1. Calculate the new concentrations of HA and A^(-)

We can use an ICE table for the calculation.

HA + H2O ⇌ H3O^(+) + A^(-)

I/mol:__0.3000.300

C/mol:_-0.020+0.020

E/mol:__0.2800.320

pH = pKa + log([A^(-)]/[HA]) = 4.75 + log((0.320 mol/L)/(0.280 mol/L))

= 4.75 + log1.143 = 4.75 + 0.058 = 4 .81

This result makes sense because adding a base to a buffer should increase its pH.

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

im not exactly sure but i think its b!