4. What is bromythymol blue?
An universal indicator. It turns yellow when placed
in an acid. Bright blue in a base.
5. What is Universal Indicator and how
can you use it to test an unknown
solution?
Anacid/base indicator. It turns different colors
depending upon the strength of the acid and base.
You use a color chart to find the number that
corresponds to the pH scale.
6. How does the pH number of a
strong acid compare to the pH of a
weak acid?
A strong acid will have a pH of 0-1.
A strong base will have a pH of 13-14
7. What is the difference between an
acid and a base?
An acid has a H ion.
A base has a hydroxide ion.
8. What sort of foods are acids?
lemons, oranges, anything with citric acid. Also
milk is slightly acidic.
12. How can you compare
strengths of acids using the pH
scale?
For every number difference on the pH
scale, it is that many power of ten times more
acidic.
Hard to explain…….. For instance….. If you’re
comparing something with a pH of 2 to
something with a pH of 6…. the pH of 2 is ten
thousand times more acidic than the pH of
six.
6-2=4……….. that means it’s 10 to the fourth
power stronger. Ten to the fourth is 10,000