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Question 5 A.solution of sodium chloride is made by adding 300cm^3 of water to a flask containing 200cm^3 of 0.50moldm^-3 oldm-3 sodium chloride. Whatis the concentration of the resulting solution? 0.05moldm^-3 B 0.1moldm^-3 c 0.2moldm^-3 D 0.3moldm^-3
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(236 Oylar)
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Usta · 5 yıl öğretmeni
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To find the concentration of the resulting solution, we need to calculate the total amount of sodium chloride in the solution and divide it by the total volume of the solution.Given information:- Initial volume of sodium chloride solution: 200 cm³- Initial concentration of sodium chloride solution: 0.50 mol/dm³- Volume of water added: 300 cm³Step 1: Calculate the total amount of sodium chloride in the initial solution.Amount of sodium chloride = Concentration × VolumeAmount of sodium chloride = 0.50 mol/dm³ × 0.2 dm³ = 0.1 molStep 2: Calculate the total volume of the resulting solution.Total volume = Initial volume + Volume of water addedTotal volume = 200 cm³ + 300 cm³ = 500 cm³ = 0.5 dm³Step 3: Calculate the concentration of the resulting solution.Concentration = Amount of sodium chloride / Total volumeConcentration = 0.1 mol / 0.5 dm³ = 0.2 mol/dm³Therefore, the concentration of the resulting solution is 0.2 mol/dm³.The correct answer is C) 0.2 mol/dm³.