Litmus paper is usually used to see how
acidic or basic something is. The most common
type of litmus paper used is yellow, and turns
red when something is acidic, and blue if it is
basic. But salt water is neutral in terms of
acidity and basicity. So the litmus paper will
stay yellow because yellow is the color it turns
for something neutral.
That's a good idea, to test water with litmus
paper. Litmus paper tells you how much or how
little acid is in the water. Acid makes things
taste sour. Vinegar and orange juice and lemon
juice all have acid in them.
But maybe you want to know how much salt is
in the water. One way to do that is to let some
water sit in a plate until all the water dries
up, and then you can weigh how much stuff is
left. It's a little more complicated than that,
but that's the general idea.
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