Warm Up # 1 Using the terms solution, solvent and solute, explain how dissolving works. What property of water allows it to have a lower density in its.

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Presentation transcript:

Warm Up # 1 Using the terms solution, solvent and solute, explain how dissolving works. What property of water allows it to have a lower density in its solid state in comparison to its liquid state? What type of solution could you have if you heated up a saturated solution on a hot plate for an extended period of time? Initially, how would heating up the solution affect its solubility?

Warm Up #2 Convert 45.8 grams of Ca(NO3)2 into moles. If a solution is said to be “concentrated,” what does that mean? What is the difference between a saturated solution and a supersaturated solution?

16.3 Molarity and Hydrates

Molarity Molarity (M) – concentration of a solution Dilute vs. Concentrated

Finding Molarity (M) M = mol/L mol…use T-Charts L…move decimal Grams…mols (periodic table) Molecules…mols (6.022x1023) L…move decimal mL/cm3…three spaces left

Practice Problems: You dilute 50.0 grams of HCl into a 2000. mL beaker and fill the rest with water. What is the concentration of your solution? You have a 100. mL solution of aqueous NaCl with a molarity of 0.500 M. Calculate, in grams, the amount of NaCl you have in your solution.

Warm Up #3 Compare the concentrations of an unsaturated, saturated and supersaturated solution. How would they all differ? Calculate the volume, in milliliters, that is required to make a 0.45 M sample using 79.0 grams of AgCl. Calculate the amount, in grams, of sodium carbonate it would take to make a 4.5 M solution using 25.0 mL of liquid.

Warm Up #3 Explain why crushing the crystals would help them dissolve faster. If the concentration of a 600 mL NaOH solution is 0.753 molar…how much NaOH is needed, in grams? In the lab we were working with Copper (II) Sulfate Pentahydrate. A) what is the chemical formula for this substance and B) find the percent composition of water for this.

Hydrates Review Hydrate – a compound containing water Ex. MgSO4 • 7H2O Magnesium Sulfate Heptahydrate Compound name + “prefix-hydrate” % Water = (total mass of water/mass of total substance) x 100%

Practice Problem Determine the percent of WATER in K2S · 4 H2O. Name this compound. If you had a 12.0 gram sample of K2S · 4 H2O, how much would you have once you evaporated all of the water off using a hot plate?