What molar ratio of acetic acid to sodium acetate is required to create a buffer solution having a pH of 4.93 at 25°C? Ka for HC2H3O2 is 1.8 × 10–5.

0.65

Explanation:

= Acid ionization constant of acetic acid =

= Potential of hydrogen of buffer solution =

Acid ionization constant is given by

Applying on both sides of the equation we get

Here the acetic acid and acetate concentration are equal so we get

The ratio of acetic acid to sodium acetate is 0.65

1. 1 mole of anything contains 6.022x10^23 pieces  

d  

2. a  

3. c, number  

5. 1.24x10^24atoms / 6.022x10^23atoms/mole = 2moles h2 atoms  

6. fe2br3 mass = 2moles x mass fe + 3 moles x mass br  

molar mass = grams / number of moles = g/mole  

to find moles = g / molar mass  

to find mass = g = molar mass / moles