A 10.0 mL sample of liquid bleach is diluted to 100. mL in a
volumetric flask. A 25.0 mL aliquot of this solution is analyzed
using the procedure in this experiment. If 10.4 mL of 0.30 M
Na2S2O3 is needed to reach the equivalence point, what is the
percent by mass NaClO in the bleach? Hint: Percent by mass is grams
of NaClO / mass of bleach. Presume a density for the bleach of 1.00
g/mL.
•A 25.00 mL volume of commercial hydrogen peroxide (H2O2)
solution was diluted to 250.0 mL in a volumetric flask. Then 25.00
mL of the diluted solution were mixed with 200 mL of water and 20
mL of H2SO4 and titrated with 0.02123 M KMnO4. The first pink color
was observed with 27.66 mL of titrant. A blank prepared from water
in place of H2O2 required 0.04 mL to give visible pink color. Find
the molarity of the commercial H2O2.
If you combine 280.0 mL of water at 25.00 °C and 140.0 mL of
water at 95.00 °C, what is the final temperature of the mixture?
Use 1.00 g/mL as the density of water.
If you combine 360.0 mL of water at 25.00 °C and 100.0 mL of
water at 95.00 °C, what is the final temperature of the mixture?
Use 1.00 g/mL as the density of water.
If you combine 400.0 mL of water at 25.00 �C and 140.0 mL of
water at 95.00 �C, what is the final temperature of the mixture?
Use 1.00 g/mL as the density of water.
If you combine 330.0 mL of water at 25.00 °C and 100.0 mL of
water at 95.00 °C, what is the final temperature of the mixture?
Use 1.00 g/mL as the density of water.
Jackie diluted 7.5 mL weak acid with 7.5 mL distilled water.
Then she titrated the diluted weak acid with 0.100 M NaOH. It takes
22.52 mL of NaOH to reach the equivalence point. What is the
original concentration of the weak acid? What is the diluted
concentration of the weak acid?
f you combine 320.0 mL of water at 25.00 °C and 100.0 mL of
water at 95.00 °C, what is the final temperature of the mixture?
Use 1.00 g/mL as the density of water.
17.11 g of Al2(SO4)3 is dissolved in water to make 500 mL
solution. What is the concentration of aluminum ion and sulfate ion
in the resulting solution
Solution A contained 40 cm3 volume of wine diluted to 100 cm3
using deionized water. Solution B contained 1 cm3 taken from
Solution A and diluted to 10 cm3 with deionised
water. After running Solution B through the GC it was
found it contained 0.045 cm3 of ethanol. What is the % alcohol by
volume (ABV) in the original wine sample?