Ka question help please

ok guys i need a lil bit of help on dis question ok
an acid HX has, Ka=5.25x10-5 moldm-3.A solution was formed by mixing 10.5cm3 0f 0.800M NaOH with 25.0cm3 of 0.920 M HX

1)Calculate da numba of moles of X- ions present in da solution formed.

2)Calculate da numba of moles of HX which remained unreacted :confused:

Reply 1

charco

Study Forum Helper

ok, this is a typical buffers question

1. Calculate the moles of acid left after the reaction and then the concentration of the acid
2. Calculate the moles of salt produced by the reaction and then the concentration of the salt in the solution
3. Apply the buffer law expression derived from Ka= [H+][A-]/[HA]

for more help on buffers see http://www.ibchem.com/IB/ibnotes/full/aab_htm/9.4.htm