Answer to Question #337244 in General Chemistry for Zooboy

Question

What is the solution of measuring 25ml of a0.2 hydrochloric acid into a conical flask and titrated with sodium hydroxide.It was found that 15ml of sodium hydroxide was needed to neutralize the acid.(a)Write a balanced chemical equation for the reaction.(b)calculate the concentration of the sodium hydroxide solution.(c).Calculate the ph of the acid is 1.4×10^-5M.

Answer 1

First write out the chemical equation:

^{​​​​​​}HCl + NaOH -> NaCl + H₂0

Next construct a table with the information we have and in what units.

Next write out what calculation triangle we need:

Number of moles = vol in dm3 X concentration = 0.0024 mol

One mole of HCl: one mole of NaOH, therefore 0.0024mol of NaOH

Concentration = no of moles / vol in dm3 = 0.096 mol/dm3 to 2dp.