5 L of NaOH solution of pH 12 contains

Question

5 L of NaOH solution of pH 12 contains (A) 200 g (B) 0.2 g (C) 20 g (D) 2 g

Tardigrade Admin · Accepted Answer

pH of solution = 12 Hence, pOH = 14 -12 = 2 ⇒ [OH-] = 10-2 mol/L 1 L contains 10-2 moles of OH- ions. Hence, 5 L will contain 5 × 10-2 moles of OH- ions. Now, no. of moles = (w/mol .mass) w = 5 × 10-2 × 40 = 2 g

Q. 5L of NaOH solution of pH 12 contains

200 g

0.2 g

20 g

2 g

pH of solution =12 Hence, pOH=14−12=2 ⇒[OH−]=10−2mol/L 1L contains 10−2 moles of OH− ions. Hence, 5L will contain 5×10−2 moles of OH− ions. Now, no. of moles = mol.massw​ w=5×10−2×40=2g

Q. $5 L$ of $N a O H$ solution of pH $12$ contains