His aunt said, "Drink hot water with a little
peppermint in it." His mother told him to take a little baking
soda in water. His brother said, "Try some hot lemonade."
Which advice should he have followed?

_APPLICATION 86._ Two women were bleaching a faded pair of
curtains. The Javelle water which they had used was made of
bleaching powder and washing soda. Before hanging the curtains
out to dry, one of them said that she was afraid the Javelle
water would become so strong as the water evaporated from the
curtains that it would eat the curtains. They decided they had
better rinse them out with something that would counteract
the soda and lime in the Javelle water, and in the laundry and
pantry they found: ammonia, blueing, starch, washing powder,
soap, vinegar, and gasoline. Which of them, if any, would it
have been well to put in the rinsing water?

INFERENCE EXERCISE

Explain the following:

531. Solid pieces of washing soda disappear in hot water.

532. Greasy clothes put into hot water with washing soda
become clean.

533. If you hang these clothes up to dry without rinsing them,
the soda will weaken the cloth.

534. Lemon juice in the rinsing water will prevent washing
soda from injuring the clothes.

535. If you hang them in the sun, the color will fade.

536. A piece of soot blown against them will stick.

537. A drop of oil that may spatter against them will spread.

538. The clothes will be easier to iron if dampened.

539. The creases made in ironing the clothes will reappear
even if you flatten the creases out with your hand.

540. After they have been worn, washed, and ironed a number of
times, clothes are thinner than they were when they were new.

SECTION 57. _Effervescence._

What makes baking powder bubble?

What makes the foam on soda water?

Did you ever make soda lemonade? It is easy to make and is rather
good. Try making it at home. Here are the directions:

EXPERIMENT 112. Make a glass of ordinary lemonade (half
a lemon, 1-1/2 teaspoonfuls of sugar; fill the glass with
water). Pour half of this lemonade into another cup or glass.
Into the remaining half glass stir half a teaspoonful of soda.
Drink it while it fizzes. Does it taste sour?

When anything fizzes or bubbles up like this, we say that it
_effervesces_. Effervescence