# Are you ready for your quiz tomorrow? Take out a scratch sheet of paper, a pencil/pen, and a calculator.

## Presentation on theme: "Are you ready for your quiz tomorrow? Take out a scratch sheet of paper, a pencil/pen, and a calculator."— Presentation transcript:

Are you ready for your quiz tomorrow? Take out a scratch sheet of paper, a pencil/pen, and a calculator

1.A gas at 3 atmospheres has a solubility of 17 g/L. If we changed the pressure to 20 atmospheres, what is the gas’s solubility? 2.We have a 30% solution of sodium chloride. We made this solution by adding 57 grams of salt to how many grams of water? 3.What is the concentration of a solution made from 170 grams of BaCl 2 and 300 grams of water? 4.We have 256 grams of a 30% sodium chloride solution. How many grams of salt and how many grams of water were used to make the solution? 5.Don’t forget about your solubility curves!! You’ll see these types of problems tomorrow.

1. A gas at 3 atmospheres has a solubility of 17 g/L. If we changed the pressure to 20 atmospheres, what is the gas’s solubility? 3x = 340 x = 113 g/L

2. We have a 30% solution of sodium chloride. We made this solution by adding 57 grams of salt to how many grams of water?

3. What is the concentration of a solution made from 170 grams of BaCl 2 and 300 grams of water?

4. We have 256 grams of a 30% sodium chloride solution. How many grams of salt and how many grams of water were used to make the solution?

Sometimes the terms diluted and concentrated are not specific enough Just like in a cooking recipe, in chemistry lab you may need a certain amount to make your experiment work properly

Molarity (M) Molarity, M, molar concentration 2 M = pronounced as 2 molar Molarity is another way to express concentration as moles per liter This means you need to remember your flow chart so that you can convert from grams to moles if grams is given in the problem!

Remember if we’re given grams to get to moles we do Molar Mass Grams / mole x Particles (atoms or molecules) Moles Avogadro’s Number 6.02 x 10 23 particles/mole ÷ x Mass (grams) ÷

We can manipulate the molarity equation…

What is the molarity of a solution containing 58 grams of sodium chloride in 1 liter of water?

Calculate the molarity of 100 mL solution containing 50 grams of H 2 SO 4. Don’t forget that we must use Liters! Remember King Henry Died Unexpectantly Drinking Chocolate Milk– KHDUDCM 100 mL = 0.1 L

How many grams of salt would be dissolved in 1 L of a 0.5 M solution of NaCl