Download Physiology problem set—Answer key

Physiology problem set—Answer key
If you have problems/questions on any of these, please contact Tess (the SI) or me so we can clarify!
How many milligrams are in a gram?
1000 mg
How many microliters are in a liter?
106 (1,000,000) µl
How many milliliters are in a microliter?
0.001 ml
If the weight of calcium phosphate [CaHPO4] is 136, how many molecules are in a mole of calcium
phosphate?
6 x 1023 molecules
Given that the weight of CaHPO4 is 136, how many grams of CaHPO4 would you need to make 1 liter of a
0.5 molar solution?
68 grams
How many grams of CaHPO4 would you need to make 1 liter of a 5% solution?
50 grams
How many grams of CaHPO4 would you need to make 300mls of a 1 molar solution?
40.8 grams
The weight of sucrose is 360. How many grams of sucrose would be added to 500 milliliters to make a
0.9% solution?
4.5 grams
Given that the weight of sucrose is 360, how many grams of sucrose would be necessary to make 1 liter
of a 0.3 molar solution?
108 grams
How many grams of sucrose would be necessary to make 10 milliliters of a 30 millimolar solution?
0.108 grams
What is the concentration of ‘normal saline’?
0.9% NaCl
What is the molarity of a normal saline solution? In other words, how many moles of NaCl (weight =
58.4) are in 1 liter of normal saline?
0.154 Molar or 154 mM (millimolar)
Which of the following solutions has the highest concentration of H+?
a.) Coke; pH 2.4
b.) Vinegar; pH 3.0
c.) Shampoo; pH 8.0
d.) Bleach; pH 10.8
A solution of diluted bleach with a pH of 9.0 has 10 times more / fewer (circle one) hydrogen ions than a
shampoo having a pH of 8.0.
Extracellular fluid has a normal pH of
Extracellular fluid has
105
7.4
.
times more / fewer circle H+ than Coke (pH 2.4).
If the concentration of hydrogen ions in a solution of vinegar (starting pH: 3.0) is increased ten-fold, the
new pH will be
2.0
.