Why do metals decrease in mass in acids?

Jul 15, 2017

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.......

$M g \left(s\right) + 2 H C l \left(a q\right) \rightarrow M g C {l}_{2} \left(s\right) + {H}_{2} \left(g\right) \uparrow$

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

And thus mass of $M g C {l}_{2} \equiv \ldots \ldots \ldots \ldots$

$\frac{5 \cdot g}{24.3 \cdot g \cdot m o {l}^{-} 1} \times 95.2 \cdot g \cdot m o {l}^{-} 1 \cong 20 \cdot g$ 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?