Chalk in concentrated hydrochloric acid?

You will see the rapid release of bubbles of CO2 gas. The carbon dioxide comes from the "active ingredient" in chalk which is calcium carbonate. The amount of bubbling will be a good indicator of the rate of reaction.

HCl(aq) + CaCO3(s) --> CaCl2(aq) + CO2(g) + H2O(l)

Since the rates of chemical reactions increase with increasing concentration, then it is safe to say that decreasing the concentration of HCl will decrease the rate of reaction.

lol dont pay attention to that guy. NaOH is in simple terms as harmfull as HCl, so in the experience that your not putting the marvelous ultimate quantity your going to be precise lower back the place you began. interior the lab you utilize usual baking soda, sodium bicarbonate, then you definately can use as much as you want, the gasoline given off is carbon dioxide thoroughly harmless =) motives the different each and every physique is faulty: NaOH is greater risky to residing organisms than HCl( maximum drain cleaners are NaOH or KOH and bleach is sodium hypochlorite an exceptionally sturdy oxidizer and its conjugate acid is hypochlorous acid, additionally an oxidizer AKA not stable for marine existence! besides the risky high quality of acid in lakes isn't by way of threat of low pH on fish. Aluminum is barely soluble at very extreme or very low pH so mutually as NaOH would artwork in case you utilize too plenty poisonous aluminum ions are lower back!