pH levels of products how to prove it?? (1 Viewer)

[Hemi]

okay i need help.
Imagine i had three skin care products all claiming to be pH 5.5. Now by doing an experiment, how do i prove this?

 

[Hemi]

please help me

 

[Gummy_bear]

Use a universal indicator, smear some of the product on it, see what colour it turns and use the chart to see what acidity it is.

If you dont know what universal indicator is, ask your teacher or use a textbook.