Question 1
Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water?
◦ 1.06 M
◦ 0.528 M
◦ 2.11 M
◦ 0.792 M
◦ 0.943 M
Question 2
One method of determining the concentration of hydrogen peroxide (H
2O
2) in a solution is through titration with the iodide ion. The net ionic equation for this reaction is
H
2O
2 + 2I
– +2H
+→ I
2 + 2H
2O
A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution. What is the concentration of hydrogen peroxide in the sample?
◦ 5.568 × 10
–2 M
◦ 0.2227 M
◦ 0.1010 M
◦ 0.4041 M
◦ 0.1114 M
Determining an Absorption Spectrum
Bohr Model of Hydrogen Atom
H2O2 Comic
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Delta Method Solution
What is the concentration?