ALEVEL CHEMISTRY QUESTION!!! ph initially?

Posted on 2017-05-05 18:30:00 in Chemistry by MARINDA

1. 20 cm3 of methanoic acid (Ka = 1.8 x 10-4 moldm-3) of concentration 0.10 moldm-3 is titrated against sodium hydroxide of concentration 0.05 moldm-3. 
a) Calculate the pH of the solution: 
i) initially 

i've redone this so many times i'm not sure why im getting it wrong. 
The answer on the site said it was pH 2.37

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