pH chuchu Flashcards
If pH < 7, then the solution is
acidic
If pH = 7, then the solution is
neutral
If pH > 7, then the solution is
basic
Human blood is consider ________ with a pH of _______
basic, 7.35-7.45
The letters pH stand for
potential of hydrogen
pOH stands for
potential of Hydroxide
expressed as the negative logarithm of the hydrogen-ion concentration.
pH
expressed as the negative logarithm of the hydroxide-ion concentration.
pOH
a compound that can donate a hydrogen ion
acid
a substance that accepts hydrogen ions.
base
defines acids as substances that produce H+ ions in aqueous solution while bases are substances that produce OH- ions in aqueous solution
SVANTE ARRHENIUS
Mentioned that acids are electron-pair acceptors and bases are electron-pair donor
GILBERT N. (G.N.) LEWIS
Introduced the pH scale that measures the strength of an aqueous acidic or basic solution.
SØREN PETER LAURITZ SØRENSEN (S.P.L.) SØRENSEN
What do buffers do
- Buffers prevent changes in pH.
- Buffers resist changes in the pH even when acids or bases are added.
a mixture of a weak acid or alkali and one of its salts
buffers
A principle of equilibrium shift due to changes in buffer conditions.
La Chatelier’s Principle
In our blood, ____________ is the most important buffer
carbonic acid
a simple test to check if a substance is acidic or basic using a paper.
Litmus Test
Blue litmus paper turns red for ______ pH
Red litmus paper turns blue for ______ pH
acidic
basic
paper impregnated with organic compounds that change their color at different pH values.
INDICATOR PAPER
should be calibrated first before being operating the device.
PH METER
an indicator that can be used to determine the pH value of a solution
pH paper
an indicator that is used to determine the acidity or the basicity of a solution
litmus paper
why should we calibrate ph meter
Small changes in electrode output occur over time, as well as from one electrode to another. For these reasons, the instrument should be calibrated periodically to ensure accurate and reliable measurements.
The standard procedure for calibrating a pH meter is to
calibrate it at three different pHs, what are those measurements
(pH 7:neutral, pH 4:acidic, and pH 10:basic).
