what is the molarity of a solution prepared by dissolving 1.25g of hcl in water to make 30 centimeter cube of solution
mols HCl = grams/molar mass
Then M = mols/L solution.
To find the molarity of a solution, you need to know the amount of solute (in moles) and the volume of the solution (in liters). The equation for molarity (M) is:
Molarity (M) = moles of solute / volume of solution (in liters)
To find the moles of solute, you can use the formula:
moles = mass of solute / molar mass of solute
In this case, the solute is HCl. The molar mass of HCl is the sum of the atomic masses of hydrogen (H) and chlorine (Cl), which is approximately 1 + 35.5 = 36.5 g/mol.
So, the moles of HCl can be calculated as follows:
moles = 1.25 g / 36.5 g/mol
Now, let's determine the volume of the solution in liters. The given volume is 30 cm³, but we need to convert it to liters. There are 1000 cm³ in 1 liter, so:
volume of solution (in liters) = 30 cm³ / 1000 cm³/L = 0.03 L
Now that we have both the moles of HCl and the volume of the solution in liters, we can calculate the molarity:
Molarity (M) = moles of HCl / volume of solution (in liters)
Molarity = (1.25 g / 36.5 g/mol) / 0.03 L
Finally, plug the values into a calculator to find the molarity. The result will be in moles per liter (mol/L), also known as Molarity.