Concentration Of Solutions (GCSE Chemistry)

What mass in grams of solute would give a 0.500 mol/dm3 solution if dissolved to make 250 cm3, for a substance with Mr = 120?

When performing a titration, why is it good practice to take the mean of concordant titre results rather than include an outlying anomalous titre?

A solution contains 35.0 g/dm3 NaCl. Sodium is 39.34% by mass of NaCl. What is the concentration of sodium (g/dm3) in the solution?

How many particles (molecules) are present in 0.250 mol of a substance? (Use Avogadro’s number 6.02×10^23)

When converting concentration from mol/dm3 to g/dm3 you must multiply by the Mr. Which of these shows that conversion for a 0.150 mol/dm3 solution of a compound with Mr = 100?

What mass of Na2CO3 (Mr = 106) is needed to prepare 250 cm3 of a 0.200 mol/dm3 solution?

You dissolve 4.50 g of KNO3 (Mr = 101.1) in water and make up to 250 cm3. What is the concentration in mol/dm3?

A diluted sample has concentration 0.0250 mol/dm3. If the dilution factor from stock to sample was 1 in 20, what was the stock concentration?

5.85 g of NaCl (Mr = 58.5) is dissolved to make 500 cm3 of solution. What is the concentration in mol/dm3?

In a titration the end-point volumes are 23.90, 23.45, 23.55, 23.55, 23.45 cm3. Why might the student use 23.50 cm3 for calculations instead of a single raw value?

A student finds 0.00470 mol of HCl in a titration of 25.0 cm3 sample. What is the concentration of HCl in mol/dm3?