Calculate the equivalent mass of each of the following acids.
a) HC2H3O2
b) KHCO3
c) H2SO3
Technically one can't determine the equivalent weight without knowing the reaction; however, in the absence of a reaction, and for simple acids and bases, for acids it's the molar mass/number of replaceable H atoms. For a that is molar mass/1.(The H alone and on the left side is replaceable but the 3 H atoms in the middle are not)
For b it is molar mass/1
For c it is molar mass/2
For bases it is molar mass/number of replaceable OH ions.
THANX!!!!!!!!!!!!!!!!!!!!!!
would the units be grams????
what grade question is it?
ITS a college class in high school. Im takin it in grade 12
If molar mass is in grams, yes.
To calculate the equivalent mass of an acid, we need to consider its chemical formula and its molar mass.
a) HC2H3O2 (acetic acid)
Step 1: Determine the molar mass of acetic acid (HC2H3O2).
The molar mass is the sum of the atomic masses of all the atoms in the formula.
The atomic mass of hydrogen (H) is 1 gram/mole.
The atomic mass of carbon (C) is 12 grams/mole.
The atomic mass of oxygen (O) is 16 grams/mole.
Using the formula HC2H3O2:
H (1) + C (2) + H (3) + O (2) = 1 + 2(12) + 3(1) + 2(16) = 60 grams/mole
Therefore, the molar mass of acetic acid (HC2H3O2) is 60 grams/mole.
Step 2: Determine the number of acidic hydrogens.
Acetic acid (CH3COOH) has one acidic hydrogen, which is the hydrogen attached to the carboxyl group (-COOH).
Step 3: Calculate the equivalent mass.
The equivalent mass is the molar mass divided by the number of acidic hydrogens.
Equivalent mass of HC2H3O2 = molar mass / number of acidic hydrogens
= 60 grams/mole / 1
= 60 grams/mole
Therefore, the equivalent mass of HC2H3O2 (acetic acid) is 60 grams/mole.
b) KHCO3 (potassium hydrogen carbonate)
Step 1: Determine the molar mass of potassium hydrogen carbonate (KHCO3).
The atomic mass of potassium (K) is 39 grams/mole.
The atomic mass of hydrogen (H) is 1 gram/mole.
The atomic mass of carbon (C) is 12 grams/mole.
The atomic mass of oxygen (O) is 16 grams/mole.
Using the formula KHCO3:
K + H + C + O3 = 39 + 1 + 12 + 16(3) = 100 grams/mole
Therefore, the molar mass of potassium hydrogen carbonate (KHCO3) is 100 grams/mole.
Step 2: Determine the number of acidic hydrogens.
Potassium hydrogen carbonate (KHCO3) has one acidic hydrogen, which is the hydrogen attached to the carbonate group (-CO3).
Step 3: Calculate the equivalent mass.
The equivalent mass is the molar mass divided by the number of acidic hydrogens.
Equivalent mass of KHCO3 = molar mass / number of acidic hydrogens
= 100 grams/mole / 1
= 100 grams/mole
Therefore, the equivalent mass of KHCO3 (potassium hydrogen carbonate) is 100 grams/mole.
c) H2SO3 (sulfurous acid)
Step 1: Determine the molar mass of sulfurous acid (H2SO3).
The atomic mass of hydrogen (H) is 1 gram/mole.
The atomic mass of sulfur (S) is 32 grams/mole.
The atomic mass of oxygen (O) is 16 grams/mole.
Using the formula H2SO3:
H2 + S + O3 = 2(1) + 32 + 16(3) = 82 grams/mole
Therefore, the molar mass of sulfurous acid (H2SO3) is 82 grams/mole.
Step 2: Determine the number of acidic hydrogens.
Sulfurous acid (H2SO3) has two acidic hydrogens, which are the two hydrogens bonded to the sulfur atom.
Step 3: Calculate the equivalent mass.
The equivalent mass is the molar mass divided by the number of acidic hydrogens.
Equivalent mass of H2SO3 = molar mass / number of acidic hydrogens
= 82 grams/mole / 2
= 41 grams/mole
Therefore, the equivalent mass of H2SO3 (sulfurous acid) is 41 grams/mole.