If I have to make a solution with sodium bicarbonate (baking soda) how do i find the molarity and how do i correctly make the solution???
i.e. how do i prepare a solution of sodium bicarbonate with a molarity of 0.01?
Remember the definition for molarity is # mols/L. # mols = g/molar mass.
Thus, to prepare a 1 molar solution of NaHCO3, dissolve 1 mol of NaHCO3 (that's close to 84 grams but you need to calculate to find the exact number) is a little water, then make to a final volume of 1 L.
What is the molarity of a sodium chloride solution if 31.0 grams of sodium chloride is added to enough water to make 1.84 liters of solution?
To prepare a solution of sodium bicarbonate (baking soda) with a molarity of 0.01, you will need to know the molecular weight of sodium bicarbonate and the desired volume of the solution.
Here's how you can calculate the molarity and prepare the solution:
1. Find the molecular weight of sodium bicarbonate:
The molecular weight of sodium bicarbonate (NaHCO₃) is calculated by adding the atomic weights of each element present in the compound. In this case:
Sodium (Na) = 22.99 g/mol
Hydrogen (H) = 1.01 g/mol
Carbon (C) = 12.01 g/mol
Oxygen (O) = 16.00 g/mol
Multiply the atomic weights by the number of atoms in the compound and sum them up:
Molecular weight of NaHCO₃ = (22.99) + (1.01) + (12.01) + (3 × 16.00) = 84.01 g/mol
2. Calculate the amount of sodium bicarbonate needed:
To prepare a solution with a desired molarity of 0.01, you need to determine the number of moles of sodium bicarbonate required. The amount of substance (moles) can be calculated using the relationship:
Moles = Molarity × Volume (in liters)
Since we want a final volume of the solution, you will need to know the desired volume of your solution. Let's assume you want to make 500 mL (0.5 L) of the sodium bicarbonate solution.
Moles of NaHCo₃ = Molarity × Volume
Moles of NaHCo₃ = 0.01 mol/L × 0.5 L = 0.005 moles
Now, to convert moles to grams, multiply the number of moles by the molecular weight of sodium bicarbonate:
Mass of NaHCO₃ = Moles × Molecular Weight
Mass of NaHCO₃ = 0.005 moles × 84.01 g/mol = 0.42 g
Therefore, to prepare a solution of sodium bicarbonate with a molarity of 0.01, you need to measure 0.42 grams of baking soda.
3. Prepare the solution:
To prepare the solution:
- Measure out 0.42 grams of sodium bicarbonate (baking soda) using a balance.
- Dissolve the measured sodium bicarbonate in a small amount of distilled water to ensure it fully dissolves.
- Transfer the dissolved sodium bicarbonate to a volumetric flask.
- Add distilled water to the volumetric flask until the final volume reaches 500 mL (0.5 L).
- Mix the solution thoroughly to ensure homogeneity.
Remember to always wear appropriate personal protective equipment (PPE) such as gloves and safety goggles when handling chemicals.