Knowledge
What does the term dilution mean?
To reduce concentration by adding more solvent.
A 250.0 mL measuring cup of cleaning solution contains 1.2 mmol of dissolved ammonia. What is the molar concentration of this solution?
0.0048 mol / L
Not ion concentration(ran out of slots):
A fish tank requires a concentration of 2.00 ppm of dissolved oxygen to support aquatic life. What volume of water would contain 30.0 mg of dissolved oxygen?
15.0L
In a chemical analysis, a 50.0 mL sample was diluted to 250.0 mL and analyzed. If the diluted solution had a concentration of 0.075 mol/L, what was the concentration of the original sample?
0.38 mol/L
What does it mean when a solution is very concentrated? What does it mean when a solution is very dilute? Draw pictures to represent the two different solutions.
A sports drink contains 3.20 g of sugar per 100.0 mL of the drink. What mass of sugar is present in a 350.0 mL bottle of this drink?
11.2 g or 0.0112 kg
FREEBIE!
What volume of a 800.0 ppm solution is required to prepare a 3.00 L solution with a concentration of 150.0 ppm?
0.563 L
Name four lab equipments you need when preparing a solution from a solid.
Answers may vary:
Volumetric flask, funnel, stopper, beaker, stirring rod, wash bottle, scale, weighing boat, eye dropper
Rubbing alcohol, C3H7OH(l), is sold as 70.0% V/V solution for external use only. What volume of pure C3H7OH(l) is present in a 500.0 mL bottle?
0.350 L
What mass of aluminum sulfate is required to prepare 2.50 L of solution with a [Al3+] of 0.140 mol/L?
59.9g
You need to prepare 500.0 mL of a 0.2500 mol/L solution from a stock solution that has a concentration of 2.000 mol/L. How much water will you add to the concentrated stock solution?
0.4375 L or 437.5 mL
Rearrange the following to the correct order.
1. Fill until the bottom of meniscus is on the calibration line.
2. Calculate the mass of solid/solute required.
3. Dissolve the solid in distilled water (use approx. half the final volume).
4. Cover and invert several times to mix.
5. Weigh the required mass of solute in a clean, dry beaker.
6. Transfer the solution to a clean and dry volumetric flask. Rinse beaker and add to flask three times (3X) with small amounts of water.
253614
Red gold is an alloy which typically contains 75.0% w/w gold and 25.0 % w/w copper. If a jewelry made of red gold weighs 250g. How much gold and copper are there in the jewelry(in grams)?
188 g of gold
62.5 g of gold
Given reaction equation:
2A + 5B -> 7C + 4D
If [B] = 0.500 mol/L
Find [A], [C], [D]
[A] = 0.200 mol/L
[C] = 0.700 mol/L
[D] = 0.400 mol/L
YOU LOSE!
The team that selected this tile loses 400 points!
What is the first step of preparing a solution by dilution?
Calculate the volume of stock solution required
What mass of zinc nitrate is required to prepare 2.00 L of a solution with a concentration of 0.25 M?
95g
What is the [Cl–] when 800.0 g of zinc chloride is dissolved in 4.50 L of solution?
2.61 mol/L
A 500.0 mL bottle of 2.95 mol/L HCl acid isdiluted to make 5.00% w/v solution. Find the volume of diluted solution that is prepared.
(Hint: Convert 5.00% w/v into mol/L)
1.08 L