Finding the pH of slime

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In summary, you would need to calculate the molarity and amount of all the substances you are using to make the slime, and then calculate the pH.
  • #1
TL;DR Summary
So I'm basically doing an experiment where I am going to add different amounts of acid and base in order to change the pH of slime. ( I heard putting acid and base causes the forming and breaking of bonds inside the slime)
How would I be able to calculate the pH of slime?

I learned how to "add" pH's, like I know how to get a new pH from adding one solution to another.
But I'm not sure on how to calculate the pH of slime.
From what i know so far, this is all I will be making to make the slime:
(Poly – Vinyl Alcohol (PVA), water, Tetraborate Na2B4O7 , and deonized water)
Do I need to figure out how much the molarity and amount of all these substances I'm going to use and calculate the pH??

I'm trying to experiment the viscosity of the slime as I put different concentrations of acid and base in the slime.
The ultimate goal I'm trying to get is to see the relationship between pH and viscosity.
(I will be putting slime inside a graduated cylinder, drop a ball inside it, and use the viscosity equation (viscosity = [2(ps-pl)ga2]/9v))

++also will I be able to increase the pH of the slime by simply just adding more of the same pH of base? or would I have to change the pH of base every time.
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  • #2
irumi said:
Do I need to figure out how much the molarity and amount of all these substances I'm going to use and calculate the pH??

pH calculation is a rather broad subject (or, actually, quite a narrow one, depends on how you look at it ;) ).

I suggest you look at any GenChem101 course, they always have part called "chemical equilibria", typically combined with dissociation of acids and bases and pH related stuff, that's what you will need.

Broadly speaking for research like yours calculation of pH is a very good starting point when designing the experiment and estimating amounts of strong acid/base required to change pH, but during the experiment you should simply measure the pH.

Borax solutions, with multiple dissociation steps, are quite challenging to deal with when doing pH calculations by hand, I suggest you look for some specialized software.
  • #3
So basically I designed an experiment to see if adding a base/acid to a slime to change its pH will effect viscosity.
But as I started researching more, I also found out adding borax to slime disturbs the hydrogen bonds of polymers within the slime, just like changing the pH of slime.

Obviously, I don't want to do the same experiment; if adding acid/base is the same thing as changing the borax when making slime, that would be doing basically the same thing.

So i was wondering, is the same thing happening because of the same reason? if so, would there be a way to tweak the experiment a little bit to still see the relationship between pH and viscosity?
When I was reading chemistry behind adding borax to slime, I don't think I saw a lot of pH stuff, so I want to make sure if they are the same thing or not.

1. What materials do I need to find the pH of slime?

To find the pH of slime, you will need a pH indicator (such as litmus paper or a universal indicator solution), distilled water, a small sample of slime, and a clean container or test tube.

2. How do I prepare the slime sample for pH testing?

First, make sure to wash your hands and any utensils used to handle the slime to avoid contamination. Then, take a small amount of slime and mix it with distilled water in a clean container. The ratio of slime to water should be about 1:10. Stir well to ensure the slime is fully dissolved in the water.

3. Can I use any pH indicator to test the pH of slime?

Yes, you can use any pH indicator that is suitable for aqueous solutions. However, keep in mind that different indicators have different color ranges and may require different amounts of slime solution for accurate results. It is recommended to use a universal indicator as it covers a wider range of pH levels.

4. How do I interpret the results of the pH test on slime?

The pH scale ranges from 0 to 14, with 7 being neutral. A pH below 7 indicates acidity, while a pH above 7 indicates alkalinity. The color change of the indicator will correspond to a specific pH level. Compare the color of your indicator to a pH color chart to determine the pH of your slime sample.

5. What factors can affect the pH of slime?

The main factors that can affect the pH of slime are the ingredients used to make the slime and any external contaminants. For example, if the slime contains acidic or basic ingredients, it will affect the overall pH. Additionally, if the slime comes into contact with dirty or contaminated surfaces, it can alter the pH. It is important to use clean materials and wash hands before handling slime for accurate pH testing.

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