What volume of water should be added to 250cm3 of 1.0mhcl to prepare 0.25m?
Answers
Answer:
Concentrated HCl is 12 M, which means 12 moles/L or 0.012 moles/mL.
A 0.1 M solution of HCl has 0.1 moles/L. So for 1 liter of solution, you need 0.1 moles of HCl.
To get 0.1 moles of HCl requires 8.33 mL con HCl:
(0.012 moles/mL)(x mL) = 0.1 moles
x = 0.1/0.012 = 8.33
But remember from above: This is for 1 L of solution, so you need to dilute that 8.33 mL of con HCL up to a total volume of 1 liter (meaning you add the 8.33 mL con HCl to 991.67 mL water.)
Always add acid to water, not the other way around - the dilution of HCl in water produces heat, and you want that heat to be dissipated over as much volume as possible.
The phrase to remember is: “Add acid to wata, as you aughta.”
Answer:
First, calculate the molarity of commercial HCl solution. see label on reagent bottle & note down three things. That means suppose you want to make 1 liter or 1000 ml of 0.2 M hydrochloric acid then you should take 1.77 ml of concentrated hydrochloric acid & dilute it to 1000 ml with water.