emescferrall wrote:My coach told me this morning that I will be competing Water Quality for the first time on Saturday. My partner has done it before, but she didn't have any notes. Please help!!! Has the Wiki been updated yet???
colorado mtn science wrote:I noticed that I was making a mistake calibrating my salinometer, and I'm thinking this might be a common mistake. When mixing saline solutions I would mess up my total. For example, if I wanted 4% salinity, I would mix 400 g of distilled water with 16 g of salt, because 16 is 4% of 400. However, my total solute to solution ratio would be 16 g of salt over 416 total grams of saltwater solution, and 16 is not 4% of 416. Basically, my results were thrown off because I didn't take into account the total amount of solution. What I should have done to get 400 g of 4% salt water was to mix 16 grams of salt with 384 grams of water. Has anyone else made this mistake?
Cjkowalcz wrote:Electronic salinometers are allowed right? Just to clarify-- don't wanna get DQ'd or anything
Skink wrote:Cjkowalcz wrote:Electronic salinometers are allowed right? Just to clarify-- don't wanna get DQ'd or anything
Go to section 3.c. of the rules and read the third sentence after the bolded one. Looking back to section 2 says the same thing. As long as you've built it, anything goes, and there have been teams in the past (particularly in the C division) who have used electronic meters. As a result, the only consideration for you is the cost-benefit analysis of whether to spend the time learning to build an electronic one or not when you can save both time and money to get a serviceable one, say, using Science Olympiad's instructions. If you have one, awesome. If not, note that it's only 5% of your score. A team who has mastered the material and does not bring a salinometer can easily win. I'm not saying don't, but you get the idea.
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