Equivalent Weight is an archaic name for 'Moles'.
Moles = mass(g) / Mr ( Relative molecular mass). or Ar (Relative Atomic Mass).
If we take the reaction of sulphuric acid and sodium hydroxide.
First write down the BALANCED reaction eq'n.
H2SO4 + 2NaOH = Na2SO4 + 2H2O
Notice the molar ratios are 1:2::1:2
So if we have 49g (H2SO4) , how much , by mass of sodium hydroxide, do we need to neutralise the acid. ? This mass of sodium hydroxide is the Equivalent Weight.
First calculate the Mr(H2SO4) from atomic masses on the Periodic Table.
2 x H = 2 x 1 = 2
1 x S = 1 x 32 = 32
4 x O = 4 x 16 = 64
2 + 32 + 64 = 98
So moles(H2SO4) = 49g / 98 = 0.5 mole.
By molar ratios above
1 mole reacts with 2 moles
Hence
0.5 moles reacts with 1 mole.
So we need 1 mole(NaOH)
Again calculate the Mr(NaOH)
1 x Na = 1 x 23 = 23
1 x O = 1 x 16 = 16
1 x H = 1 x 1 = 1
23 + 16 + 1 = 40
Using the moles equation again
moles = mass( g)/Mr
Algebraically rearranging
mass(g) = moles X Mr
Mass(NaOH) = 1 moles X 40 =
mass(NaOh) = 40 g ( The 'Equivalent Weight). This is the mass required to neutralise 49 g of sulphuric acid.
To calculate the equivalent weight of an oxide, you first determine its molecular weight. Then you look at how many oxygen atoms are present in the formula of the oxide and divide the molecular weight by that number of oxygen atoms. This result is the equivalent weight of the oxide.
How do you calculate equivalent weight of anhydrous citric acid?Read more: How_do_you_calculate_equivalent_weight_of_anhydrous_citric_acid
To calculate the mass in grams of each sample, you can use a balance or scale to measure the weight of the sample. The weight measured in grams is equivalent to the mass of the sample.
Gram equivalent weight is calculated by dividing the molar mass of the compound by the number of equivalents of the species involved in the reaction. It is a measure of the mass of a substance that provides one equivalent of the species of interest in a chemical reaction.
The equivalent weight of phosphorus pentoxide can be calculated by dividing its molecular weight by the number of equivalents of the component of interest it provides. Phosphorus pentoxide (P2O5) has a molecular weight of 141.94 g/mol and provides 2 equivalents of phosphorus (P). Therefore, the equivalent weight of phosphorus pentoxide is 70.97 g/mol.
To calculate the equivalent weight of an oxide, you first determine its molecular weight. Then you look at how many oxygen atoms are present in the formula of the oxide and divide the molecular weight by that number of oxygen atoms. This result is the equivalent weight of the oxide.
How do you calculate equivalent weight of anhydrous citric acid?Read more: How_do_you_calculate_equivalent_weight_of_anhydrous_citric_acid
To calculate the mass in grams of each sample, you can use a balance or scale to measure the weight of the sample. The weight measured in grams is equivalent to the mass of the sample.
the sum of the atomic weights for all the atoms in the formula
Gram equivalent weight is calculated by dividing the molar mass of the compound by the number of equivalents of the species involved in the reaction. It is a measure of the mass of a substance that provides one equivalent of the species of interest in a chemical reaction.
The equivalent weight of phosphorus pentoxide can be calculated by dividing its molecular weight by the number of equivalents of the component of interest it provides. Phosphorus pentoxide (P2O5) has a molecular weight of 141.94 g/mol and provides 2 equivalents of phosphorus (P). Therefore, the equivalent weight of phosphorus pentoxide is 70.97 g/mol.
The equivalent weight of calcium carbonate can be calculated by dividing its molecular weight by the number of acidic hydrogen ions that it can donate in a reaction. In the case of calcium carbonate, it can donate two moles of hydrogen ions, so the equivalent weight would be its molecular weight divided by 2.
The densities of NH3 at variable temperatures are - At boiling point - 0.86 kg/m3 At 15 oC - 0.73 kg/m3 At -33 oC - 681.9 kg/m3 (liquid) At -80 oC - 817 kg/m3 (transparent solid)
What is the unit weight of aluminium section and how its calculate
The formula to calculate the percentage of weight loss is: (Initial weight - Current weight) / Initial weight x 100.
The equivalent weight of a salt is the molecular weight of the salt divided by the number of ions produced when the salt dissolves in water. It is used to calculate the amount of salt needed in a reaction based on the amount of ions present.
In chemistry, equivalents are calculated by dividing the given amount of a substance by its equivalent weight. The equivalent weight is the amount of a substance that can react with or replace one mole of hydrogen ions. This calculation helps in determining the amount of a substance needed for a chemical reaction.