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4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc. What will be the molarity of the solution?
  • a)
    0.615 mol L-1
  • b)
    0.428 mol L-1
  • c)
    0.99 mol L-1
  • d)
    0.301 mol L-1
Correct answer is option 'B'. Can you explain this answer?
Most Upvoted Answer
4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc...
No. of moles of NaOH = 4.28/40 = 0.107 Volume of solution = 250 cm3
M = n/V(in L) = 0.107/250 x 1000 = 0.428 mol L-1
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Community Answer
4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc...
To find the molarity of the solution, we need to first calculate the number of moles of NaOH present in the solution and then divide it by the volume of the solution in liters.

Given:
Mass of NaOH = 4.28 g
Volume of solution = 250 cc = 250/1000 = 0.25 L

Step 1: Calculate the number of moles of NaOH
The molar mass of NaOH is the sum of the atomic masses of sodium (Na), oxygen (O), and hydrogen (H).
Na: atomic mass = 23 g/mol
O: atomic mass = 16 g/mol
H: atomic mass = 1 g/mol

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Number of moles of NaOH = mass of NaOH / molar mass of NaOH
= 4.28 g / 40 g/mol
= 0.107 moles

Step 2: Calculate the molarity of the solution
Molarity (M) = number of moles / volume of solution in liters
= 0.107 moles / 0.25 L
= 0.428 mol/L

Therefore, the molarity of the solution is 0.428 mol/L, which corresponds to option 'B'.
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4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc. What will be the molarity of the solution?a)0.615 mol L-1b)0.428 mol L-1c)0.99 molL-1d)0.301 molL-1Correct answer is option 'B'. Can you explain this answer? for NEET 2025 is part of NEET preparation. The Question and answers have been prepared according to the NEET exam syllabus. Information about 4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc. What will be the molarity of the solution?a)0.615 mol L-1b)0.428 mol L-1c)0.99 molL-1d)0.301 molL-1Correct answer is option 'B'. Can you explain this answer? covers all topics & solutions for NEET 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for 4.28 g of NaOH is dissolved inwater and the solution is made to 250 cc. What will be the molarity of the solution?a)0.615 mol L-1b)0.428 mol L-1c)0.99 molL-1d)0.301 molL-1Correct answer is option 'B'. Can you explain this answer?.
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