Ionic Equilibriums in Water
#3

Which volume (mL) of HCOOH 2.00 mol/L shall be added to 30.215 g of HCOONa to prepare a buffer solution with pH 4.00?

a

How many moles of HCOONa are present in 30.215 g of HCOONa?

0.444 mole

b

What kind of particle is HCOO-?

weak base

c

What do we get when we add HCOOH?

buffer solution

d

Calculate how many moles of HCOOH we have to add to get a buffer with pH = 4.00.

0.249 mole

e

So, how many mL of HCOOH do we have to add?

125 mL

Complete solution

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