A sample of magnesium metal reacts with hydrochloric acid solution to produce magnsesium chloride solution and hydrogen gas.

a)write a balanced chemical equation for this reaction and include phase designations.

The phase designations would be s for solid, aq for aqueous, and g for gas.

How do you do this?

Mg(s) +HCL(aq) --> MgCl(aq) + H2(g)

Would MgCl be aqueous?

See Bob Pursley's response above.

To determine the phase designation for a specific compound in a balanced chemical equation, you need to consider its solubility properties. In this case, magnesium chloride (MgCl) is water-soluble, so it would be in the aqueous phase (aq). Therefore, the balanced chemical equation should be:

Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g)

It is important to note that magnesium combines with two chloride ions to form magnesium chloride (MgCl2) since chloride ions typically have a -1 charge and magnesium has a +2 charge.