Mr. Trott's Fantastic pH Review
Write the chemical equation for a base: Ba(OH)2
Ba(OH)2 --> Ba2+ + 2OH-
Which base gives a higher pH at the same concentration? Ba(OH)2 or NaOH
Ba(OH)2 because it gives more hydroxide ions (OH-) per molecule.
bases are _______ in universal indicator
Green to Purple
H+ + Cl- + Na+ + OH- =>
H2O + NaCl
HCl + NaOH =>
H2O + NaCl
Which acid gives a lower pH at the same concentration? H2SO4 or HCl
H2SO4 because it gives more hydrogen ions (H+) per molecule.
Write the chemical equation for an acid: HCl
HCl --> H+ + Cl-
List some common acids:
HCl, H2SO4, HBr, H2CO3, HI, HC2H3O2
List some common bases:
NaOH, KOH, Ca(OH)2, Ba(OH)2
acids are _______ in universal indicator
Red to Green
What is the H+ concentration of a pH = 6 solution?
[H+] = 1x10^(-6) M
Which is more acidic: [H+] = 1x10^(-7) or [H+] = 1x10^(-8)?
[H+] = 1x10^(-7): a larger value of [H+] is more acidic.
What is the H+ concentration of a pOH= 7.70 solution?
[H+] = 5.01x10^(-7)
Which is more acidic: [OH-] = 1x10^(-8) or [OH-] = 1x10^(-7)?
[OH+] = 1x10^(-8): a smaller value of [OH-] is more acidic.
Which is more acidic: [OH-] = 1x10^(-8) or [H+] = 1x10^(-8)
[OH-] = 1x10^(-8): [OH-] = 1x10^(-8) --> [H+] = 1x10^(-6), which is greater than [H+] = 1x10^(-8).
hydroxide ion
a hydrogen atom and an oxygen atom bonded together
hydrogen ions
a hydrogen atom without any electrons (a proton)
the pH scale
a measure of the free hydrogen ion concentration in the solution
pH of less than 7 is
acidic
acids are
any compound that increases the number of hydrogen ions (H+) when dissolved in water
bases are
any compound that increases the number of hydroxide ions (OH)- when dissolved in water
hydronium ions (H3O+)
are an alternative form of H+
pH of more than 7 is
basic
bases have a ______ flavour
bitter
Low pH
high acidity
high concentration of H+
high acidity
high pOH
high acidity
low concentration of OH-
high acidity
acids react with some metals to produce
hydrogen gas
HIGH pH
low acidity
low pOH
low acidity
pH of 7 is
neutral
What is the pH of a solution with an H+ concentration of 1x10^(-10) M?
pH = 10
What is the pH of a solution with a OH- concentration of 2x10^(-8) M?
pH = 6.30
Which is more acidic: pH = 7 or [H+] = 1x10^(-8)?
pH = 7: [H+] = 1x10^(-8) --> pH = 8, which is greater than pH 7.
Which is more acidic: pH = 7 or pH = 8?
pH = 7: lower pH
What is the pOH of a solution with a H+ concentration of 2x10^(-8) M?
pOH = 6.30
bases have a
slippery feel
acids have a _____ flavour
sour
neutralization reaction
the reaction between acids and bases
acid + base =>
water and "salt"
