H+ ions increase in concentration at lower pH values.
Calculate how many more H+ ions there are in a solution
at a pH = 2 than in a solution at a pH = 6. Find the
concentration of H+ ions at a pH = 2 and at a pH = 6 in
Table B. Then divide the concentration of H+ ions at a
pH = 2 by the of H+ ions at a pH = 6. Record your
answer in Table C.
What is the concentration of H+ ions at a pH = 2?
mol/L
What is the concentration of H+ ions at a pH = 6?
mol/L
How many more Htions are there in a solution at a
pH = 2 than in a solution at a pH = 6?

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

the answer is d.) potassium