Why do metals decrease in mass in acids?

Answer 1

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

I take it that you're wondering why, in relation to the mass of the metal you add, you might obtain more mass from a reaction between a metal and an acid.

In acids, metals usually precipitate out as salts. For a basic reaction, we could proceed.

#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............

Why would it be simpler to measure the volume of the gas evolved, and what mass of dihydrogen gas would be evolved in this reaction?

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Answer 2

Cooper Anderson

Metals decrease in mass in acids due to the reaction with acid, forming soluble metal salts and hydrogen gas.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.