10% w/v means 10g of HCl in 100mL of solution and 10%w/w means 10g in 100g of solution.
1) For 10%w/v,
In 37% conc HCl,mass of HCl in 1000ml=1.19g/ml x1000ml x37%=440.3g.
mass of HCl in 100ml=44.03g.
10/44.03 x 100ml = 22.7ml of conc HCl. Add water to make up to 100ml to get 10%w/v HCl.
2) For 10%v/v,
Can you help me? What is the volume of 37% conc HCl (density 1.19g/ml) that I need to measure to make 100ml of 10%v/v HCl?