A solution with a ph of 2 has how many more protons in it than a solution with a ph of 4?

Given question is incomplete. The complete question is as follows.

A solution with a ph of 2 has how many more protons in it than a solution with a ph of 4?

(a) 100 times more.

(b) 5 times more.

(c) 1000 times more.

(d) 10 times more.

Explanation:

Concentration of hydrogen ion for a solution with pH = 2 will be calculated as follows.

              pH =

               2 =

Concentration of hydrogen ions= for a solution with pH = 4 will be calculated as follows.

             pH =

              4 =

Now, let us assume that volume of both the solutions is V ml.

Hence, mole of in pH = 2 will be calculated as follows.

                 =

Mole of in pH = 4 will be calculated as follows.

                 =

So,    

                            =

                            = 100

Hence, mole of pH equal to 2 = 100 mole of

Thus, we can conclude that a solution with pH of 2 has 100 times more protons in it than a solution with a pH of 4.

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

the answer is d.) potassium