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I will dilute the gravy by adding the milk and heat.
strong acid.
using the equation M1V1 = M2V2,
V2 = M1V1/M2 = 1 x V/ 0.5
basically, whatever volume of 1M HCl you have, add the same mount of water and you will dilute it to 0.5M.
2hcl- + k2co3====>2h2co3+2kcl
more dilute not less dilute. "Less Dilute" means more concentrated.