A student is investigating the pH of a substance. The pH of the unknown substance is 5.4. Which of the following substances is the unknown substance most likely to be? How do you know? Answer using a CER format using the above graphic organizer. Use evidence from the simulation in your response. Digitally complete, and then email a copy of the graphic organizer OR print and take a photo and email.
Substance A, which has a H3O+ concentration of 4x10^-6
Substance B, which has a H3O+ concentration of 6x10^-7
Substance C, which has a H3O+ concentration of 55
Substance D, which has a H3O+ concentration of 1.3x10^-1

Explanation:

pH is a measure of the concentration of H₃O⁺ ions in a solution.

It is defined as:

For the given substances

Sustance        [H₃O⁺]         pH = - log [H₃O⁺]

                           M

    A                4×10⁻⁶         -log (4×10⁻⁶) = 5.4 ← answer

    B                6×10⁻⁷         -log (6×10⁻⁷) = 6.2

    C               error                      - - - - - -

    D               1.3×10⁻¹        -log (1.3×10⁻¹) = 0.89

Thus, the unknown substace most likely is A.

nuclear fission produces elements that are heavier than helium.

the elements that are used in nuclear fission and their products are much heavier than helium.