Tuesday 12th May- Year 5 Home Learning: Science

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,

Mr M

43 thoughts on “Tuesday 12th May- Year 5 Home Learning: Science

  1. First I done 100 ml I couldn’t see any dissolving at 200ml it started to dissolve same result happened then I reached 300 ml and used two to three teaspoons the water looked suitable enough to be salt water

  2. Science:
    1)First, I started with 1 teaspoon of salt for 200ml of (cold)water.
    2)After that,I did 3 teaspoon of salt for 400ml of (cold) water
    3)Next,I did 6 teaspoon of salt for 600ml of (cold) water.

  3. Some tips for making a salt-water solution:
    #Do not put more salt then half the water. The salt needs some space to mix with the water.
    #Make the solution with hot water. That makes the solution get made faster.

  4. For my experiment i used 1 teaspoon of salt and 200ml of water and after it started dissolving a lot but it all sunk down so i tried it again but i used 3 teaspoon and it dissolved a tiny bit more so thats how it was.

  5. I have done this experiment first I got one cup of cold water (100ml) and when added one tea spoon of salt, the salt did not dissolve and this would no be suitable for the fishes. Secondly, I then got another cup of water (200ml) and added one tea spoon of salt in this cup of water the salt only dissolved a little bit so this cup of water will also not be suitable for the fishes. Finally, I got one last cup of water (hot water 200ml) when I added the salt the salt dissolved very quickly and then I added some cold water in as the hot water may hurt or burn the fish.

  6. Firstly we prepared the experiment. I added some table salt into a large jar filled with warm water. I then mixed the salt with the water and waited until it cooled down. I put my finger in it and felt like sea water.

    I think I could put more salt in and change the temperature of the water.
    My mum sent the pictures.

    • Firstly we prepared the experiment. I added 2 teaspoons table salt into a large jar filled with 400 ml of warm water. I then mixed the salt with the water and waited until it cooled down. I put my finger in it and felt like sea water.

      I think I could put more salt in and change the temperature of the water.
      My mum sent the pictures.

  7. For my experiment, I used 200ml of water with 1 teaspoon of fine sea salt. The things I kept the same was the amount of water, the type of salt and the amount of salt. The thing that I changed was the temperature of the water.
    I found out that it is best to use really hot water, as hot as possible and mix it with salt. After that you can put in some cold water for the fish.

  8. Science homework

    I am trying to work out why salt doesn’t dissolve in water, when put in to a cup of water.

    I got an empty plastic cup and put 100ml of water into it and the added 1 teaspoon of normal salt, and watch it sink to the bottom. I will try again but increase the value of amount of water I add.

    I got another plastic cup and put 200ml of water into it, and again added 1 teaspoon of normal water, and watch it sink to the bottom. I have notice even increase the amount of water, it does not make a difference.

    My conclusion is to make the salt dissolve you need to stir it, and in both clockwise and anti clockwise and this dissolved the salt. The temperature of the water make no difference because value weight of the water is light and weight of the salt is heavier. That’s why the salt was sinking to the bottom of the cup.

  9. We first got an empty glass and poured in 200 ml of water , then we added 1 teaspoon of salt into the cup the salt went straight to the bottom and settled. After that we added 100ml to the cup the sal raised up a little bit the same happened again when we added another 100ml which took us to 400ml. We then added another 100 ml which meant we had 500ml with this the salt up even more and started to swirl around . If you were to more water in then the salt would dissolve more . In my opinion, for a fish tank you would put less salt and more water .

  10. You could have 1 teaspoon of salt and 100ml but heat makes things dissolve quicker so you could use hot water to make it quicker but the downside to that is fish can not live in hot water or they will die so we cant just put in the hot salt water as it will kill the fish so you should put an extra 100ml to cool it down so the fish can actually survive.

  11. With 200ml of water ( cold)
    and 1 tsp of British table salt and it is starting to disolve with out mixing it
    It sunk to the bottom so I have to mix it a bit It didn’t work so It went into a big pile so i am going to leave the salt in it and add 1an add 50Ml of water into the 1000.
    It has has started to disolve a little more but not all yet.
    I am going to clean my jug and start again and try again with 300ml of water and 2tsp.

  12. With 200ml of water ( cold)
    and 1 tsp of British table salt and it is starting to disolve with out mixing it
    it sunk to the bottom so I have to mix it a bit It didn’t work so It went into a big pile so i am going to leave the salt in it and add 1an add 50Ml of water into the 1000
    It has has started to disolve a little more but not all yet
    I am going to clean my jug and start again and try again with 300ml of water and 2tsp.

    • Are you all working together in the same place on this, because we should still be social distancing folks. Or, are we trying to take credit for someone else’s work?

  13. With 200 ml of Water (cold) and 1 tsp of British table salt and it is starting to dissolve with out me mixing it .
    It just all sunk to the bottom so I had to mix it just a bit !
    It didn’t work because when I mixed it, I t just went in a pile again so I am going to leave the salt in and add in 50ml of water into the 100,ml
    It has started to dissolve a little more but not all yet!
    I am going to clean my jug. And try again with 300ml of water and 2tsp.
    I let it try and dissolve whilst I did my maths work. It dissolved well md I just added 50ml more water and it smelt like it was good for. A salt water

    • I think you should thank Lexi for this Reyan. Without her commenting earlier, you wouldn’t have been able to use the Copy and Paste function and risk putting in any effort. I’m disappointed in you.

  14. We put 200ml of cold water with on teaspoon of salt which didnt dissolve we then tried 400ml of boiling hot water and added a teaspoon of salt which partly dissolved so we topped up the water to 500ml which then dissolved.

    • Hi Keisha. Read through the method for this scientific experiment. You start off with 200ml of water and a teaspoon of salt. It is your investigation, you will change one variable. This variable can be the quantity of water, quantity of salt, temperature of the water , if the water is still or swirling. Make a prediction as to what you think will happen. You could record your findings in table format. Remember to use the scientific vocabulary in your conclusion. You could take photos and send them in with your completed work to yr5upload@broadheath.coventry.sch.uk.

  15. With 200 ml of Water (cold) and 1 tsp of British table salt and it is starting to dissolve with out me mixing it .
    It just all sunk to the bottom so I had to mix it just a bit !
    It didn’t work because when I mixed it, I t just went in a pile again so I am going to leave the salt in and add in 50ml of water into the 100,ml
    It has started to dissolve a little more but not all yet!
    I am going to clean my jug. And try again with 300ml of water and 2tsp.
    I let it try and dissolve whilst I did my maths work. It dissolved well md I just added 50ml more water and it smelt like it was good for. A salt water fish

Leave a Reply