Question

РЕШИТЕ ПЛИЗ ОЧЕНЬ НАДО К 250 Г 10 %РАСТВОРА ДОБАВИЛИ 150 Г ВОДЫ .ОПРЕДЕЛИТЬ КОНЦЕНТРАЦИЮ РАСТВОРА К 150 Г 15 %РАСТВОРА NACL ДОБАВИЛИ 10 Г NACL. ОПРЕДЕЛИТЬ КОНЦЕНТРАЦИЮ РАСТВОРА К 200Г 20% РАСТВОРА NACL ДОБАВИЛИ 10Г NACL И 150 Г ВОДЫ . ОПРЕДЕЛИТЬ КОНЦЕНТРАЦИЮ ПОЛУЧЕННОГО РАСТВОРА

Answer 1

1)m(NaCl) = 0,15 * 150 = 22,5 г(NaCl) 
 22,5 + 10 = 32,5 г(NaCl)
 150 + 10 = 160г(масса р-ра)
 32,5/150 = 0,21 = 21% - консентрация расствора
2) 200 * 0,2 = 40 г(NaCl)
  40 + 10 = 50 г (NaCl)
  200 + 10 = 210(масса р-ра)
  50/210 = 0,23 = 23% 
 

Answer 2

Calculating Concentration of Solutions

To calculate the concentration of a solution, we can use the formula:

Concentration (C) = (mass of solute / total mass of solution) * 100%

Let's calculate the concentration for each scenario.

1. 250g of 10% Solution with 150g of Water Added - Initially, the mass of solute (salt) is 10% of 250g, which is 25g. - After adding 150g of water, the total mass of the solution becomes 250g + 150g = 400g. - Therefore, the concentration of the resulting solution is: - C = (25g / 400g) * 100% = 6.25% - 2. 150g of 15% Solution with 10g of NaCl Added - Initially, the mass of solute (salt) is 15% of 150g, which is 22.5g. - After adding 10g of NaCl, the total mass of the solution becomes 150g + 10g = 160g. - Therefore, the concentration of the resulting solution is: - C = (22.5g / 160g) * 100% = 14.06% - 3. 200g of 20% Solution with 10g of NaCl and 150g of Water Added - Initially, the mass of solute (salt) is 20% of 200g, which is 40g. - After adding 10g of NaCl and 150g of water, the total mass of the solution becomes 200g + 10g + 150g = 360g. - Therefore, the concentration of the resulting solution is: - C = (40g / 360g) * 100% = 11.11% - In summary, the concentrations of the resulting solutions are approximately: 1. 6.25% 2. 14.06% 3. 11.11%