Question

К 200г 10% раствора (KCl) добавили 50г (H2O). Найти w(KCl)?

Answer 1

kcl + h20= koh + hcl

m кcl= 20г

n= 0,27моль

n hcl= 0,27

масса= 0,27* 36,5= 9,855

масса раствора= 20+50-9,855= 60

w= 20/60= 0,333

Answer 2

Calculation of w(KCl)

To find the weight percent of KCl in the solution, we need to calculate the total weight of KCl in the solution and divide it by the total weight of the solution.

Given: - Initial weight of the 10% KCl solution = 200g - Weight of water added = 50g

To calculate the weight percent of KCl, we need to find the weight of KCl in the initial solution.

Using the given information, we can calculate the weight of KCl as follows:

Weight of KCl = Initial weight of the solution - Weight of water added = 200g - 50g = 150g

Now, we can calculate the weight percent of KCl:

w(KCl) = (Weight of KCl / Total weight of the solution) * 100

Substituting the values:

w(KCl) = (150g / (200g + 50g)) * 100 = (150g / 250g) * 100 = 60%

Therefore, the weight percent of KCl in the solution is 60%.