water
- Created by: issy12345678910
- Created on: 29-05-19 16:59
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- water
- potable water; is water thats been treated
- its not pure
- pH between 6.5 and 8.5, low salt level, no bacteria
- 1. filtration- a wire mesh screens out large twigs
- 2. gravel and sand beds filter out any smaller particles
- 3. sterilisation- the water is sterilised to kill and harmful bacteria. this is done by bubbling chlorine gas through it or by using ozone or ultraviolet light
- 2. gravel and sand beds filter out any smaller particles
- if a substance is soluble it will dissolve in a certain amount of solvent
- 1. Measure accurately 100 cm3 of water and add to a beaker
- 2.Add small amounts of the solute until no more can dissolve
- 3. Record the mass of an evaporating dish
- 4. Filter the mixture so the undissolved solid is left behind and the solution is in the evaporating dish
- 5. Remove the water by heating or evaporation
- 6. Weigh the evaporating dish with the solute in it and calculate the mass of the solute that was dissolved
- 5. Remove the water by heating or evaporation
- 4. Filter the mixture so the undissolved solid is left behind and the solution is in the evaporating dish
- 3. Record the mass of an evaporating dish
- 2.Add small amounts of the solute until no more can dissolve
- solids become more soluble as temperature increases
- 1. Measure accurately 100 cm3 of water and add to a beaker
- soft and hard water
- hard water contains Mg and Ca ions
- happens when the water comes into contact with rocks (permanent contains (CaSO4))
- temporary hardness (caused by Ca(HCO3)2) is removed by boiling water, which leaves a layer of limescale
- improves health care
- some people prefer the taste
- helps reduce heart disease
- limescale
- pipes can 'fur up' causing blockages
- hard water can be softened using..
- ion exchange
- sodium carbonate
- soft water lathers easily with soap hard water doesn't
- hard water contains Mg and Ca ions
- salt water can be desalinated
- potable water; is water thats been treated
- 1. put a known volume of water into a boiling tube
- 2. add soap solution one drop at a time and shake
- 3. record the number of drops needed to make i lather
- soft water lathers easily with soap hard water doesn't
- 2. add soap solution one drop at a time and shake
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