Good morning Year 5!
I need your help folks, somewhat urgently if I’m honest! My home aquarium has leaked overnight and my pet fish (Tangs, Clownfish and Damselfish) are in danger if I cannot top it up with enough water. The thing is, they are saltwater fish so if I simply fill their tank up with tap water, it will kill them. I need a saltwater solution, quickly!
So, to help me out, I need to know the quickest way to dissolve salt in water to create the solution my fish need. What speeds up the dissolving of salt in water? And, being a teacher, I thought I’d link my problem to a learning opportunity for you!
So, please investigate this problem for me. Remember, this is science and needs to be accurately completed. Too much salt in the water can also kill my pet fish!
Start with 1 teaspoon of salt for 200ml of water. Think about what variables you could change to improve the speed in which the salt dissolves. What are you testing in your experiment? The temperature of the water? The quantity of water? The quantity of salt? Still or moving water? For example, if you are testing if the amount of water affects the speed the salt dissolves, you will need to test different quantities of water (100ml, 200ml, 300ml, 400ml for example) but keep the temperature of the water, the quantity of salt and water movement (no stirring) the same.
What is your prediction? How will you record your results? When writing your conclusion, remember to include accurate scientific vocabulary. Words that may help you: variable, test, prediction, dissolve, solution, solvent (water), solid, liquid, temperature, quantity,
Email your work, including photos of you completing your experiment, to the Year 5 email address. Have fun, but please help my pet fish soon! Thanks,