CHM 1020 Lab 9 Assignment SUMMER 2026 WGU

Name:____Haley Bockelman_____ CHM 1020 W9 Lab
Show your CALCULATIONS for the numerical problems.

Lab 9 Assignment
Review of acids/bases and acid-base neutralization:
https://www.youtube.com/watch?v=n9wUdgxCLMQ

1. What species is the conjugate acid of HCO3–? Write the formula and net charge.
Carbonic acid
H2CO3
Net charge: zero (neutral)



2. Which species is the conjugate base of HPO42–? Write the formula and net charge.

PO4 3-
Net charge: -3

Refresher of Acid/Base Equilibria, Ka, and pKa, and buffer solutions

Show your CALCULATIONS for these numerical problems.
https://www.youtube.com/watch?v=jdmHjFp_35I

1. The [H3O+] in a cabernet sauvignon wine is 5.9 × 10–4 M. What is the [–OH] in this wine?
[OH-] = 1.698*10^11M
PH= =log[H3O+] = -log5.9*10^-4 = 3.23
POH= 14-3.23 =10.77
[OH] = 10^pOH = 10^10.77 = 1.698*10^-11M
[OH]= 1.698*10-11M


2. The pH of a lime is 1.90. What is the [H3O+]?
[H3O+]= 0.01259M
PH= -log[H3O+]
[H3O+] = 10^-pH =10^1.9==0.01259M
[H3O+]= 0.01259M


3. What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10–9 M H3O+?
PH=-log[H3O+]=-log(7.4*10^9=8.13
PH=8.13


4. Normal gastric juice has a pH of about 2. Assuming that normal gastric juice is primarily aqueous
HCl, what is the concentration of HCl in the stomach?

2==log[H+]


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