What happens when we pass co2 through lime water for a long period of time.
why

➷ The limewater will turn cloudy/milky. This is because this reaction causes the insoluble calcium carbonate to form. As it is insoluble, it turns the solution cloudy. (this would happen if it was a short time.) Over a longer period of time, the solution would turn clear again. This is because a salt called calcium hydrogen carbonate is formed from the calcium carbonate. This salt is soluble and would dissolve, causing it to turn clear again.

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yes

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as given the equation is

2al + 6 hcl > 2 alcl3 + 3 h2(g)

as per equation two moles of aluminum reacts with six moles of hcl to give two moles of alcl3 and three moles of hydrogen gas

given: three moles of al are present and 7 moles of hcl

for three moles of aluminum nine moles of hcl will be required

however as 7 moles of hcl are present so the limiting reagent is hcl

hcl is going to decide the number of moles of product formed

when six moles of hcl are present = 3 moles of h2 are formed

when one mole of hcl is present == 3/6 mole sof h2 will be formed

when 7 moles of hcl are present = 3 x 7/ 6 moles of h2 will be formed = 3.5 moles of h2