how many grams of salt (NaCl) must be dissolved in water to make 2 M salt solution?
To find out how many grams of salt (NaCl) must be dissolved in water to make a 2 M salt solution, we need to know the molar mass of NaCl.
The molar mass of NaCl is calculated by adding the atomic masses of sodium (Na) and chlorine (Cl). The atomic mass of sodium is 22.99 g/mol, and the atomic mass of chlorine is 35.45 g/mol. Therefore, the molar mass of NaCl is 22.99 + 35.45 = 58.44 g/mol.
To make a 1 M solution of NaCl, we dissolve 58.44 grams of NaCl in 1 liter of water.
To make a 2 M solution, we need to double the amount of NaCl.
So, to make a 2 M salt solution, we would need to dissolve 2 x 58.44 grams = 116.88 grams of NaCl in 1 liter of water.
How much water? I'll pick 1 L of solution (not 1 L of water).
M = moles/L of solution.
2 = mols/1 L so you need 2 moles.
grams = mols NaCl x molar mass NaCl = ?