Solutions.

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Presentation transcript:

Solutions

Identifying set of properties matter Pure substances Identifying set of properties Elements Only 1 kind of atom Compounds Bonded atoms of 2 or more elements Mixtures Properties of 2 or more substances Homogeneous Same throughout Solution Heterogeneous Different throughout colloid suspension

Solutions 2 parts Solute- what is being dissolved Solvent – what is doing the dissolving

volume Solute and solvent particles take up space Volume of solution must account for both parts

Concentration How much solute is dissolved in a solvent Many different units used Which one you use depends on what you are doing

molarity Most common unit Moles of solute per liter of solution Symbol: M We say molar Molarity= 𝑚𝑜𝑙𝑒𝑠 𝑠𝑜𝑙𝑢𝑡𝑒 𝐿 𝑠𝑜𝑙𝑢𝑡𝑖𝑜𝑛 Make sure L solution not solvent

What is the molarity of 2.30L of a salt water solution that contains 22.5g NaCl? How many grams of HCl are dissolved in 2350.mL of a 2.12M HCl solution?

How many L of a 0.13M CuSO4 solution contain 16.82g CuSO4?

molality Mole solute per kg solvent Used in BP and MP calculations Symbol: m We say molal molality = 𝑚𝑜𝑙𝑒𝑠 𝑠𝑜𝑙𝑢𝑡𝑒 𝑘𝑔 𝑠𝑜𝑙𝑣𝑒𝑛𝑡

What is the molality of a solution made from 98.3g KCl and 4.2kg H2O? How many g NaOH are mixed with 1100.mL of H2O to make a 0.10m NaOH solution?

How many kg of H2O would you need to add to 125 How many kg of H2O would you need to add to 125.25g Ba(OH)2 to make a 0.0500m Ba(OH)2 solution?