How Much Sodium Bicitrate Is Required for a pH 5.42 Solution?

[jumbogala]

Homework Statement

What mass of sodium bicitrate would be needed to prepare a 1.00 L solution with a pH of 5.42?

Homework Equations

[H30+]=10^-pH

The Attempt at a Solution

First of all, I don't know what sodium bicitrate is, so I can't write the equation for it. What's bicitrate?

I wanted write the equilibrium expression for Ka. But I can only find the concentration of the [H30+] and not anything else... I have no idea how to do this question. Help please?

 

[Kushal]

if pH = 5.42, what is pOH equal to?

then [OH-] = 10^-pOH