Dioxin is considered to be poisonous in concentrations above 2 ppb. If the lake containing 1 x 107 L has been contaminated by 0.1 g of dioxin, what is the concentration in ppb and did the concentration reach the dangerous level?
1. Dioxin is considered to be poisonous in concentrations above 2 ppb. If the lake containing 1 x 107 L
has been contaminated by 0.1 g of dioxin, what is the concentration in ppb and did the concentration
reach the dangerous level?
a. 0.1 ppb, no it didn’t reach the dangerous level
b. 10 ppb, yes it reached the dangerous level
c. 0.01 ppb, no it didn’t reach the dangerous level
d. 100 ppb, yes it reached the dangerous level
2. What is the percent by mass concentration of acetic acid, CH3COOH, in a vinegar solution that
contains 54.50 g acetic acid in a 1.000 L solution? The density of the solution is 1.005 g/mL.
a. 3.447%
b. 4.447%
c. 5.447%
d. 6.447%
3. How many grams of NaOH is dissolved in 200 mL of a 1 M solution? (Atomic weights: Na = 23, O =
16, H = 1)
a. 1 g
b. 40 g
c. 8 g
d. 200 g
4. A 100mL solution contains 4g of NaOH. If 50mL of water is added to this solution, which of the
following will remain unchanged?
a. Molarity of the solution
b. Number of moles of NaOH
c. Percent by weight of NaOH
d. Normality of the solution
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