1 / 11

SOLUTIONS

SOLUTIONS. Chapter 7 Beg Che m. SOLUTION. Is a s_______ dissolved in a s_________ We can work out the concentration of a solution A saturated solution is one that can dissolve no more solute at a given temperature. MAKING RARO. A packet of raro weighs 95g

adolfo
Download Presentation

SOLUTIONS

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. SOLUTIONS Chapter 7 Beg Chem

  2. SOLUTION • Is a s_______ dissolved in a s_________ • We can work out the concentration of a solution • A saturated solution is one that can dissolve no more solute at a given temperature

  3. MAKING RARO A packet of raro weighs 95g • If you dissolve in 1 litre of water what will the concentration be in g L-1 • You leave it out in the sun (in Raro) and half the water evaporates, what is the new concentration • You go on camp, they use 6 packets for a 15L container of water

  4. CONCENTRATION • Example Seawater has 35g L-1 of NaCl, how much NaCl would you get if you evaporated 80mL of seawater

  5. PERCENTAGE SOLUTION • How much does 1mL of water weigh? • 1mL = 1g • 1000mL = 1000g • A 10% aqueous solution of NaCl means 10g/___g or 10g/____mL • (w/v) = weight/volume • (w/w) = weight/weight • In aqueous solutions these 2 are interchangeable as 1mL water weighs 1g

  6. EXERCISE • Act 7A Concentration by Mass (p88)

  7. MOLES PER LITRE • Only difference – change mass to moles • We use a new formula New formula Old formula

  8. STARTER • You dissolve 0.5mol of NaCl in 250mL of water, work out the concentration in mol L-1 • You want to make 300ml of a 0.2mol L-1 solution of copper sulfate. How many moles fo you need • What volume of water is need to make a 0.1mol L-1 solution with 0.05mol of PbBr2

  9. EXPERIMENT • Prac 7.1

  10. STANDARD SOLUTION • A standard solution has a known concentration • Remember the 2 important formulas

  11. EXERCISE • Read through examples 7.5 and 7.6 (p89) • Act 7C p94-95

More Related