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## Homework Statement

2. [1pt]

Which of the following solutions result in a buffer ?

a) 0.100 L of 0.250 M NH3 + 0.050 L of 0.250 M HCl

b) 0.100 L of 0.250 M NH3 + 0.100 L of 0.250 M HCl

c) 0.100 L of 0.250 M NH4Cl + 0.050 L of 0.250 M NaOH

d) 0.100 L of 0.250 M NH4Cl + 0.150 L of 0.250 M NaOH

## Homework Equations

M = mol/V

## The Attempt at a Solution

so I got the mol for each one, they are

1) .025 mol and .0125 mol

2) .025 mol and .025 mol

3) .025 mol and .0125 mol

4) .025 mol and .0375 mol

I don't know how to do it, plz help help