to the image on the next slide.
what is left in the center?
A “naked” proton!
The proton is no longer
together with its electron.
These protons are called
What charge would a loose proton have?
are positively charged: H+.
and NO neutrons!
of hydrogen that DO have neutrons.
These are called isotopes.
I want my
of hydrogen ions,
the more acidic the solution.
is a strong acid and is poisonous!
It is so strong, it can burn a hole through a table top, solid steel,
or your clothes and skin.
Let's explore pH.
are very acidic.
lemons and grapefruits are acidic.
and even eat some MILD and not so mild acids?
Taste buds are good at judging acidity.
The more sour a food is, the more acidic it is.
Which do you think is the most SOUR or acidic?
What order would you put them in? Write it down.
in the kit.
(at the center
of the book)
along with the
pH Table of Results.
H2O for water.
into the water.
to the colors on the pH Standard Chart.
The number above the best color match is the pH.
The stick shown here has a pH of 6.
A pH of less than 7 means your water is acidic.
Greater than 7 means the water is basic or alkaline.
Record the pH for water on the pH Table of Results.
and add the liquid
or powder, as shown.
DO NOT MIX the Liquids together!
the candy in water.
to test the pH
of each liquid.
the color changes stop.
match the colors on the strip
to the colors on the standard chart.
in your pH Table of Results.
A pH of 7 is neutral.
A pH that is less than 7 is acidic.
The lower the pH, the more acidic the liquid.
Which solutions were the most acidic?
Which solution(s) had a pH greater than 7?
It was basic or alkaline, not acidic.
A pH of 6 is ten times more acidic than a pH of 7.
A pH of 5 is ten times more acidic than a pH of 6
and 100 times more acidic than 7.
A pH of 1 is a lot more acidic (1,000,000 times) than a pH of 7.
Discard all your solutions. Rinse and save the experiment cups.
the first element in the periodic table?
(tea, orange juice, lemon juice and sour candy)
have hydrogen ions.
The more ions there are, the more acidic the solution is.
Remember, the symbol for the hydrogen ion is H+.
These stripped down protons seek electrons!
They “love” their missing electrons.
They are called electrophilic.
on a narrow range of pH to survive.
to neutral pH (6-7 pH) and
can tolerate wider variations in pH
than can saltwater fish.
to blue by making
the soil acidic.
azaleas and rhododendrons,
prefer an acidic soil
with a pH of less than 7.
require a pH of about 8.1.
Much lower or higher
and they will die!
is impacting the pH of Earth's oceans!
NOT A GOOD IDEA.
affects phytoplankton and zooplankton.
They cannot survive small changes in pH.
These tiny plants and animals form the base
of the marine food web.
Without them, the food chain
in the ocean collapses.
Ocean acidification has caused
MASS EXTINCTION events in the past.
It is causing another one now.
one proton is called
pH below what
ion have a charge
a positive charge