Question

Why do metals decrease in mass in acids?

Answer 1

Well masses are constant in chemical reactions.........

Explanation:

So I assume you are asking why you might get more mass out of a reaction between a metal and an acid with respect to the mass of the metal you put in.......

Metals tend to form salts in acids....... And for a simple reaction we could advance.......

`Mg(s) + 2HCl(aq) rarr MgCl_2(s)+H_2(g)uarr`

And thus were to use a `5*g` mass of metal, we would get an equimolar quantitiy of magnesium chloride........

And thus mass of `MgCl_2-=............`

`(5*g)/(24.3*g*mol^-1)xx95.2*g*mol^-1~=20*g` with respect to the salt............

What mass of dihydrogen gas would be evolved in this reaction? Why would it be easier to measure the volume of the gas evolved?