How would you prepare the following solutions?
A)2%NaCL(w/v)
B)0.35M glucose
C)0.12M CaCI2
To prepare the following solutions, you will need to know the formula weights of the compounds used and have access to a balance and a volumetric flask or graduated cylinder for measuring the amounts. Here is how to prepare each solution:
A) 2% NaCl (w/v) solution:
Step 1: Determine the mass of NaCl needed to prepare the desired concentration. Since it's a 2% w/v solution, it means 2 grams of NaCl per 100 mL of solution.
Step 2: Calculate the mass of NaCl needed for the desired volume of solution. For example, if you want to prepare 500 mL of the solution, you would need (2 g/100 mL) x (500 mL) = 10 grams of NaCl.
Step 3: Weigh out the calculated amount of NaCl using a balance and transfer it to a clean container.
Step 4: Add distilled water to the container to make up the desired final volume of solution while stirring continuously until the NaCl dissolves completely.
Step 5: Transfer the solution to a volumetric flask or a graduated cylinder and ensure it reaches the 500 mL mark or the desired volume. Mix well before use.
B) 0.35 M glucose solution:
Step 1: Determine the formula weight of glucose (C6H12O6), which is 180.16 g/mol.
Step 2: Calculate the amount of glucose needed to prepare the desired concentration. A 0.35 M solution means 0.35 moles of glucose per liter of solution.
Step 3: Calculate the mass of glucose needed for the desired volume of the solution. For example, if you want to prepare 250 mL of the solution, you would need (0.35 moles/L) x (0.250 L) x (180.16 g/mol) = 15.76 grams of glucose.
Step 4: Weigh out the calculated amount of glucose using a balance and transfer it to a clean container.
Step 5: Add distilled water to the container to make up the desired final volume while stirring continuously until the glucose dissolves completely.
Step 6: Transfer the solution to a volumetric flask or a graduated cylinder and ensure it reaches the 250 mL mark or the desired volume. Mix well before use.
C) 0.12 M CaCl2 solution:
Step 1: Determine the formula weight of CaCl2, which is 110.98 g/mol.
Step 2: Calculate the amount of CaCl2 needed to prepare the desired concentration. A 0.12 M solution means 0.12 moles of CaCl2 per liter of solution.
Step 3: Calculate the mass of CaCl2 needed for the desired volume of the solution. For example, if you want to prepare 500 mL of the solution, you would need (0.12 moles/L) x (0.500 L) x (110.98 g/mol) = 6.659 grams of CaCl2.
Step 4: Weigh out the calculated amount of CaCl2 using a balance and transfer it to a clean container.
Step 5: Add distilled water to the container to make up the desired final volume while stirring continuously until the CaCl2 dissolves completely.
Step 6: Transfer the solution to a volumetric flask or a graduated cylinder and ensure it reaches the 500 mL mark or the desired volume. Mix well before use.