technically, pH measures the amount of H+ in solution, so the lower the pH the more acidic the solution.. ("p" is a -log function, so pH is the same as -log of the concentration of H+)
so when magnesium reacts with the acid, the acid (the substance which dissociates to produce H+ in solution) is being used up, so there's less H+ in solution, so the acidity of the solution drop, and the pH level rises.
Up to a point, temperature will increase the rate of reaction between hypo and dilute hydrochloric acid. After a certain point, extreme temperature will completely shut down the process.
It could stop because there wasn't enough magnesium or hydrochloric acid for the reaction to go to completion.
chlorination
The reaction is: Zn + 2 HCl = ZnCl2 + H2
Yes, when magnesium reacts with hydrochloric acid it is a single replacement reaction. The same is true for nearly all cases of a reaction between an acid and a metal.
alkaline
Up to a point, temperature will increase the rate of reaction between hypo and dilute hydrochloric acid. After a certain point, extreme temperature will completely shut down the process.
basic
There will be an strong exothermic reaction which will flame and sputter.
The reaction is:HCl + NaOH = NaCl + H2O
Carbon dioxide gas is involved in the reaction between sodium trioxocarbonate IV and dilute hydrochloric acid
It could stop because there wasn't enough magnesium or hydrochloric acid for the reaction to go to completion.
chlorination
sheet
This reaction is exothermic.
The reaction is: Zn + 2 HCl = ZnCl2 + H2
I suppose that the reaction between fruit/vegetables juices and hydrochloric acid from the stomach are not so important. Juices can increase the acidity in stomach.