AQA GCSE Chemistry Higher Paper 1- acid pH question.
Hi guys, just wondering if anyone can recall the exact phrasing of the question on working out the pH of the hydrochloric acid. I thought it was:
A 0.15x10-3 mol solution of hydrochloric acid has pH 3.0.
Work out the pH of a 0.15x10-5 mol solution of hydrochloric acid.
Probably wrong. There is a debate over whether the question referred to the concentration of the acid, or the concentration of H+ ions in the acid.
Many thanks.
A 0.15x10-3 mol solution of hydrochloric acid has pH 3.0.
Work out the pH of a 0.15x10-5 mol solution of hydrochloric acid.
Probably wrong. There is a debate over whether the question referred to the concentration of the acid, or the concentration of H+ ions in the acid.
Many thanks.
Original post by wilksojack14
Hi guys, just wondering if anyone can recall the exact phrasing of the question on working out the pH of the hydrochloric acid. I thought it was:
A 0.15x10-3 mol solution of hydrochloric acid has pH 3.0.
Work out the pH of a 0.15x10-5 mol solution of hydrochloric acid.
Probably wrong. There is a debate over whether the question referred to the concentration of the acid, or the concentration of H+ ions in the acid.
Many thanks.
A 0.15x10-3 mol solution of hydrochloric acid has pH 3.0.
Work out the pH of a 0.15x10-5 mol solution of hydrochloric acid.
Probably wrong. There is a debate over whether the question referred to the concentration of the acid, or the concentration of H+ ions in the acid.
Many thanks.
Either way, HCl completely dissociates in water so con of H+ is same as conc of acid
Original post by sebdixon
Either way, HCl completely dissociates in water so con of H+ is same as conc of acid
So therefore the pH does not change? Or does it?
AQA doesn't really do "trick" questions (as far as I've seen in past papers) so idk. Possibly tho.
Original post by crybabynessie
I thought that it did to 5.0, but upon talking to others found that some people believed it to be a trick question, and it didn't change...
I thought it was an AQA prank/meme.
Ohhhh and I asked my sister (A* a level chem student) and she said (from my wording) that the pH was 5 but again, maybe I worded it wrong.
Original post by wilksojack14
I thought it was an AQA prank/meme.
Especially considering the previous question was about how concentration and strength are different things.
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