Answer:
Molarity of HCl solution = 0.25 M 
Step-by-step explanation:
Given data: 
Volume of NaOH= V₁ = 25.0 mL (25/1000 = 0.025 L) 
Molarity of NaOH solution=M₁ = 0.185 M 
Volume of HCl solution = V₂ = 0.0200 L 
Molarity of HCl solution = M₂= ? 
Solution: 
M₁V₁ = M₂V₂ 
0.185 M ×0.025 L = M₂ × 0.0200 L 
M₂ = 0.185 M ×0.025 L / 0.0200 L 
M₂ = 0.005M.L /0.0200 L 
M₂ = 0.25 M