The pH Scale

Question 1

How many moles of water are in 1 Liter of water?

Answer 1

55.5 moles

Question 2

How many moles of H3O+ and OH- are there in a Liter of water at any given time?

Answer 2

1x10^-7 moles of both respectively.

Question 3

What does Kw equal and mean?

Answer 3

Kw= “ion product of water” = 10^-14

Question 4

What is the equation for pH? (Write it out)

Answer 4

Question 5

Define what a Brønsted acid is.

Answer 5

An acid is a substance that can donate a proton.

Question 6

Define what a Bronstad base is.

Answer 6

A base is a substance that can accept a proton.

Question 7

What makes something a weak acid or base?

Answer 7

A molecule that can partially deprotonate in aqueous solutions.

Question 8

What is the Henderson Hasselbalch equation? And what does it tell us?

Answer 8

Question 9

Think of at least 3 ways pH affects biological systems.

Answer 9

Go to Lecture 2 BIOC 405 slide 31 and 32.
Broad:
1. Protons induce a large confirmational change of a protein.
2. Protons store energy as a concentration difference across a membrane.

Question 10

How does Haemagglutinin work? (Protien in influenza virus)

Answer 10