ASVAB Physical Science 3.1

ASVAB Physical Science 3.1. Solution A has a pH of 3, while Solution B has a pH of 8. Solution A is what?

ASVABASVAB Physical Science
General Science
ASVAB SciencePhysical Science

Transcript

00:17

And here are the potential answers.

00:18

[ mumbles ]

00:21

All right. Well, this is asking, uh,

00:24

what is a pH? Hmm? And how do you spell it?

00:27

Well, first, it's a measure of acidity

00:29

and, second, it's also kind of weird.

00:32

The pH scale runs from zero to 14.

00:34

The lower the number, the more acidic the substance is.

00:38

The higher the number, the more base it is.

00:40

If a substance has a pH of seven, like

00:43

plain water does, well, it means it's completely neutral.

00:46

Why couldn't the scale be one through ten or one through 20 or something simple? Hmm?

00:50

Well, sometimes scientists just like to make things confusing.

00:53

Consider it a perk of the job.

00:55

Well, here's one last tidbit of info before we get to the solution

00:58

or, uh, answer. We already have the solution.

01:00

See what we did there?

01:02

A lower pH means the solution has a higher concentration

01:05

of H+ ions.

01:07

And a higher concentration of H+ ions

01:09

means the solution is more acidic.

01:12

Now, onto the answer.

01:13

If the solution A has a pH of three, it's acidic.

01:16

That alone is enough to eliminate options C and D. Good-bye.

01:20

And if solution B has a pH of eight, we know it's

01:24

basic. Because a pH of greater than seven is, well, basic.

01:27

So solution A is acidic and solution B is basic.

01:31

The correct answer is option B.

01:33

Acids and bases and bears, oh, my!

01:35

[ chuckles ] [ music ]