Chemistry question involving acid to decrease pH?

Charlie

New member
Hi, if anyone can help with this it would be much appreciated!
'Hydrochloric acid of pH 1 is added to 20ml of 0.1 M sodium hydroxide solution, resulting in a solution of pH 4. The volume of hydrochloric acid used is...'
I already have the answer I just need an explanation behind the logic. Thanks in adavance :)
 
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