A lesson in Acids, Bases, and SLIME….
Keeping things fun and interesting in my house often relies on the sacrifice of cleanliness and order. Personally, I think this is a great way to live life. However, if you wish to keep slime, liquids, and Ph testers off of your counters and floors, you may want to consider laying some newspaper down, because things are about to get really messy!
We began our school day with a discussion on acids and bases. Most liquids have either basic or acidic traits, and many of the liquids we are exposed to on a daily basis are geared toward Ph neutral (around Ph7). If you need a refresher on what acids and bases are:
ACIDS: corrode metal, taste sour, change litmus tests to red, and become less acidic when mixed with bases. Examples of Acids: Lemon Juice, Orange Juice, Vinegar, Stomach Acid
Now, on to the PH Scale:
We looked this over a few times, and even drew out a copy of our own to make sure that we understood it really well. We talked about various liquids, soils, and pool chemistry, and looked at where they might fall on the Ph scale. If Habanero peppers like soil with a Ph of 6.5, does that make the soil more acidic, or basic? If our pool needs to have a Ph of 7.6, is that acid, basic, or neutral? If something has a Ph of 14, is it safe? No! What about if it has a Ph of 0? No, it might eat your skin off! If you shout these last two out with your kids, it makes this part quite enjoyable.
A way to test PH. I monitor the chemistry of the pool in our backyard, so I had an old Ph test kit on hand. You can buy litmus paper online, it’s fairly inexpensive (this place sells it for $1.95). You may even be able to find it at a local pharmacy, but you might want to call them first.
Now let your child at the Ph testing kit! My daughter had a great time using our transfer tubes to put the liquids in our test kit, and dropping the litmus liquid into the container to see what color the liquids would turn. Most of them were very acidic, with water being the exception, which was closer to neutral.
1.Get 1/2 cup of milk.
What you will find is that the acidic vinegar has quickly interacted with the basic milk. It has made the milk far more acidic, and has curdled it. Feel free to dump it down the drain now, curdled milk is pretty disgusting. Besides, we’re almost ready for the grand finale….
OOZING GLOOPY SLIME!!!
There are many ways to make slime, but only a few of them have stood up to the test of sliminess and durability. Here are two recipes for slime, courtesy of our friend Science Bob.
1/4 cup water
1/4 cup glue (Elmers or equivalent)
1/4 cup liquid starch (you can find this near the spray starches in the laundry aisle)
1. Put your glue into the mixing bowl. Some of it will stick to the cup, try to get as much as you can out of it. The more glue you have, the stickier your slime will be.
2. Add your water and mix the two together. Let your child pick out the color he/she wants to use, and let your child mix it in while you add the liquid starch. Your child will notice that the mixture is getting a little more difficult to stir.
You have about 5 seconds to double check to see if your counters are covered (if you care about such things) before your child will begin to pull the gloopy stringy mess out of the bowl and play with it. This stuff is as messy as it is fun, but it cleans up very easily.
2 disposable cups
Spoon (for stirring)
3 tbsp water
approx 1/4 cup of glue
Borax (powder form, can be found in the laundry aisle with the detergents)
1. Take one of your plastic cups and fill it with water. Add a spoonful Borax, stir, and set aside.
2. Take the other cup and add 1/4 cup (about one inch) of glue. Add 3 Tbsp of water and stir. Give the cup to your child, and let him/her add the food coloring.
3. While your child is stirring, get 1 Tbsp of the Borax solution you prepared earlier, and add it to the cup. Again, you have five seconds as this goop solidifies quite a bit before your child starts taking it out and playing with it! Here is what you will end up with:
So now you’ve had quite a busy day of chemistry experiments! If you’re still up for some more, let your child sprinkle some baking soda over your counter. Then let your child pour (slowly!) some vinegar over the baking soda. He/she will have a great time with this chemical reaction, and you can get your child to help you clean your counter without it seeming like a chore!