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250 cm3 of 0.2 molar potassium sulphate solution is mixed with 250 cm3 of 0.2 molar KCl solution. What is the molar concentration of K ions?

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Moles in solution 1= 2x0.2x250/1000 = 1000/10000 = 0.1
Remember: K2SO4 has 2 K

Moles in solution 2 = 0.05

Total moles = 0.15
Total volume = 500cm3 = 0.5L

So, M= 0.3

Helpful (1) Fun Thanks for voting Comments (5)
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kal ke revision ke liye dsc ke notes revise kar rahe the kya????????
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you see that i being a genius need not revise
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can it be a little more comprehensive? mjhy yeh question khaas samjh nai aya. will be greatful :)
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Follow these steps:-

1. Calculate moles of K+ ions by multiplying MOLARITY and VOLUME IN LITERS.
2. 1 cm = 10^-3 L

3. Get total moles of K+ ions by adding Moles of K+ in each solution.
4. Now calculate TOTAL VOLUME IN LITERS.

5. Use this formula
MOLARITY = TOTAL MOLES / TOTAL VOLUME IN LITERS
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back with a bang or .............a big bang!!!!!!
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