Which of the following statements best compares the ph value of h3po4 and hcl?

a.) both have a ph less than 7, but h3po4 has a higher ph than hcl.
b.) both have a ph less than 7, but h3po4 has a lower ph than hcl.
c.) both have a ph greater than 7, but h3po4 has a higher ph than hcl.
d.) both have a ph greater than 7, but h3po4 has a lower ph than hcl.

Option B. Both have a pH less than 7, but H3PO4 has a lower pH than HCl

Explanation:

Those are acid, so the pH would be < 7.

H₃PO₄ is a weak acid with 3 dissociations

HCl is a strong acid.

pH depends on [H]⁺

H₃PO₄  →  3H⁺  +  PO₄⁻³

HCl →  H⁺  +  Cl⁻

If both acid, have the same concentration, [H⁺]H₃PO₄ > [H⁺]HCl, that's why the pH from the phosphoric will be lower.

the answers would be

the first one and the second one

"record the time to complete a chemical reaction" would most likely be part of a lab procedure.