Hi, guys today I will be sharing what we have been doing in hurumanu 4 which is science. We are working on filtration (the action or process of filtering something) and dilution (the act of making a liquid more dilute).
KEYWORDS & TERMS:
Dilution is when you make the solution weaker. Think about adding more and more water to your raro. What happens to the flavour?
Concentrated- Lots of solutes (solid) particles are present, not many solvents (liquid).
Diluted- Lots of solvents (liquid) particles are present, not many solute (solid).
Precipitate- When a solid forms in a liquid.
Filtering is when you can separate the solute (solid) from the solvent (liquid).
Once the solvent has been filtered that is called the filtrate.
DILUTION EXPERIMENT:
Equipment- Test tube rack, 4 test tubes, pipette, the chemical solutions Copper Nitrate and Sodium Hydroxide
Method- Take 4 test tubes, in the first test-tube measure and pour in 10ml of Copper Nitrate. Then take 1ml from the first test tube and pipette into the second test tube. Add 9ml of water to make it up to 10ml. Then repeat for the third and fourth test tubes.
Making the precipitate- Now add 5ml of Sodium Hydroxide to each test tube and take a picture in front of white paper.
QUESTIONS:
1. Which test tube had the most concentrated sample of Copper nitrate? When doing the experiment we noticed that the most concentrated is the first one because it had the most copper nitrate. There was not water add to the solution and because the colour showed blue which is the colour of copper nitrate.
2. When we added water what were we doing to the concentration of the solution? We were diluting the solution to see the difference.
3. Which concentration of copper nitrate formed the most precipitate, why do you think this is the case? I believe that the first test-tube was the most concentrated formed of precipitation.
FILTRATION EXPERIMENT:
We now need to filter out precipitate/solute. This means separating the solid from the liquid. We will use filter paper.
For each test tube with the blue solute in it, place a new piece of filter paper in a funnel over a conical flask.
Label each paper 1-4 and filter each test tube through, collecting the precipitate/solute in the filter paper and the filtrate in the flask.
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