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Knowledge
Concentration
Ion Concentration
Dilution
100

What does the term dilution mean?

To reduce concentration by adding more solvent.

100

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

100

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 

100

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

200

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.

Answers may vary but concentrated implies lots of solute per set volume of solvent and dilute solution means very little solute per set volume of solvent.
200

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

200

FREEBIE!

The team that selected this category gets 200 points to themselves :P
200

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

300

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 

300

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

300

What mass of aluminum sulfate is required to prepare 2.50 L of solution with a [Al3+] of 0.140 mol/L?

59.9g

300

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

400

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

400

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

400

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

400

YOU LOSE!

The team that selected this tile loses 400 points!

500

What is the first step of preparing a solution by dilution?

Calculate the volume of stock solution required

500

What mass of zinc nitrate is required to prepare 2.00 L of a solution with a concentration of 0.25 M?

95g

500

What is the [Cl–] when 800.0 g of zinc chloride is dissolved in 4.50 L of solution?

2.61 mol/L

500

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