Kayla’s teacher gave each lab group three liquids and asked them to test their pH. Kayla tested each one and recorded her results in the chart below. She then combined the liquids and tested again. She combined liquid C and D and the resulting pH was 7.

Which statement BEST describes the process that took place when liquid C and D were combined?

F) D. The solution would be slightly acidic.

G) C. The acid and base would neutralize to form a salt.

H) A. The acid and base would neutralize to form an element.

I) B. The solution would be slightly basic.

A. The acid and base would neutralize to form an element.

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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