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why does this page mention hydrogen as a product in this acid alkaline reaction?

why does this page mention hydrogen as a product in this acid alkaline reaction?
this page is from bbc bitesize ks3

https://www.bbc.co.uk/bitesize/topics/zn6hvcw/articles/z9gnn9q

They make the point that acid+alkali --> salt+water

They give an example e.g.

Nitric acid + sodium hydroxide sodium nitrate + water

Then though in the quiz which has 5 questions, in question number 4 ,, they say




Now look at the botton there just above the next button in the image

It says



Why does it say Hydrogen there, shouldn't it say water?

When I did a google I read "The chemical reaction between Ca(OH)2 and HCL is described by the equation: 2 HCl + Ca(OH)2 CaCl2+2H2O7.”

That suggests to me that it should ave water there not hydrogen
Ca(OH)2 and HCl cannot give H2… acids and alkalis react to give a salt and water. If Ca(OH)2 and HCl react to give the salt and H2, where would the O go?
It is metals that react with acids to give a salt and H2. So don’t worry too much about it :smile:
Reply 2
Original post by TravelMasterA
Ca(OH)2 and HCl cannot give H2… acids and alkalis react to give a salt and water. If Ca(OH)2 and HCl react to give the salt and H2, where would the O go?
It is metals that react with acids to give a salt and H2. So don’t worry too much about it :smile:


So are you saying there's a mistake on the page that we've identified?
Original post by gazbo1
So are you saying there's a mistake on the page that we've identified?

It's definitely water not hydrogen. Think of it as a neutralisation reaction where the salt is produced in water
Original post by gazbo1
So are you saying there's a mistake on the page that we've identified?


It is a mistake. It should say "+ water" rather than "+ hydrogen".

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