How do you find the equivalent weight of an unknown acid?
For an acid like HCl, which has only one ionizable hydrogen, the equivalent weight is the same as the molar mass….Overview.
| Acid | Molar Mass | Equivalent Weight |
| HCl | 36.5 g | 36.5 g |
| H2SO4 | 98.0 g | 98.0g/2 = 49.0 g |
| H3PO4 | 98.0 g | 98.0g/3 = 32.7 g |
How do you find the equivalent mass in a titration?
From the titration, the molarity of the NaOH solution is calculated. Second, the equivalent mass of the unknown acid is determined by titrating a known amount of the acid with the standardized NaOH. Then the equivalent mass is calculated from the data.
How do you find the equivalent mass?
To calculate the equivalent mass of a base, simply divide the molar mass of the base by the number of hydroxyl groups. Take, for example, calcium hydroxide Ca(OH)₂. A few simple calculations yield an equivalent of 37g/mol. To find the equivalent of an acid, divide the acid’s molar mass by the number of protons.
How do you calculate equivalent weight from normality?
Normality Formula
- Normality = Number of gram equivalents × [volume of solution in litres]-1
- Number of gram equivalents = weight of solute × [Equivalent weight of solute]-1
- N = Weight of Solute (gram) × [Equivalent weight × Volume (L)]
- N = Molarity × Molar mass × [Equivalent mass]-1
What is the equivalent mass of HCl?
85.1g.
Now equivalent mass is given as the molecular weight divided by the n-factor. Therefore, the equivalent mass of HCl is 85.1g.
How do you identify an unknown acid?
All the tests can be fulfilled by graphing a titration curve.
- Calibrate pH probes using buffer solutions.
- Dissolve 0.1g unknown acid in 10mL DI water in a beaker.
- Fill buret with NaOH (molarity = 0.1198M)
- Add 2 drops of phenolphthalein indicator.
- Place pH probe in acid solution.
What is equivalent mass of an acid?
Equivalent mass of an acid is defined as the number of parts by mass of it which contains 1.008 parts by mass of replaceable hydrogen or it in the quantity of the acid by mass that supplies one mole of H+ ions.
How will you find out the equivalent mass of an acid give example?
Equivalent mass of an acid is the number of parts by mass of the acid which contains 1.008 part by mass of replaceble hydrogen atom. For example, the basicity of sulphuric acid is 2. which contains one replaceable hydroxyl ion or which completely neutralises one gram equivalent of an acid.
What is the equivalent weight of caco3?
50.045
The equivalent weight of calcium carbonate (CaCO3) is 50.045, as calculated above.
What is equivalent weight of NaCl?
58.44 g/mol.
Therefore, the equivalent weight of sodium chloride (NaCl) is 58.44 g/mol.
How to titrate an unknown acid to determine its equivalent mass?
In this part of the experiment you will use your standardized sodium hydroxide solution to titrate an unknown acid and determine its equivalent mass. Clean and rinse a 250-mL Erlenmeyer flask using deionized water.
How do you determine the molecular mass of an unknown acid?
In this experiment you will use titrations to determine the molecular mass of an unknown acid. In analytical chemistry when we use a titration or other precise means to determine the concentration of a solution it is called standardizing the solution. In the first part of this experiment you will prepare a sodium hydroxide, NaOH, solution.
How do you find the equivalent weight of an acid?
For oxidation-reduction reactions, one equivalent donates or receives a mole of electrons and the equivalent weight is the ratio of the molecular weight to the number of electrons involved in the reaction. Calculate the Equivalent mass of an acid (EM).
What is the difference between molar mass and equivalent mass?
The equivalent mass of the acid is equal to the number of grams of an acid per mole of available H+ ion: In all cases the molar mass and the equivalent mass are related by simple equations, but in order to find the molar mass from the equivalent mass we need to know the molecular formula of the acid.