Homework for Wednesday 19th

Go to the shops and buy at least one small bottle of water for the practical work we are doing in class. It will have information about the dissolved solids content on the side which is very important. If you are getting more than one bottle make sure they are different varieties. If you have, or know someone who has, a well then a sample of water from that would be good to have too. You could also possibly collect canal,river, bog or seawater but be very careful not to fall in and go with someone to make sure your'e safe.