Which of the following salt solutions would coagulate the colloid solution formed when FeCl 3 is added to NaOH solution, at the fastest rate?

Question

Which of the following salt solutions would coagulate the colloid solution formed when FeCl 3 is added to NaOH solution, at the fastest rate? (A) 10 mL of 0.1 mol dm -3 Ca 3( PO 4)2 (B) 10 mL of 0.2 mol dm -3 AlCl 3 (C) 10 mL of 0.15 mol dm -3 CaCl 2 (D) 10 mL of 0.1 mol dm -3 Na 2 SO 4

Tardigrade Admin · Accepted Answer

Formed is negatively charged solution, therefore Al 3+ has highest coagulating power

Q. Which of the following salt solutions would coagulate the colloid solution formed when $F e C l_{3}$ is added to $N a O H$ solution, at the fastest rate?

$10 m L$ of $0.1 m o l d m^{- 3} C a_{3} (P O_{4})_{2}$

$10 m L$ of $0.2 m o l d m^{- 3} A lC l_{3}$

$10 m L$ of $0.15 m o l d m^{- 3} C a C l_{2}$

$10 m L$ of $0.1 m o l d m^{- 3} N a_{2} S O_{4}$

Formed is negatively charged solution, therefore $A l^{3 +}$ has highest coagulating power

Q. Which of the following salt solutions would coagulate the colloid solution formed when FeCl3​ is added to NaOH solution, at the fastest rate?

10mL of 0.1moldm−3Ca3​(PO4​)2​

10mL of 0.2moldm−3AlCl3​

10mL of 0.15moldm−3CaCl2​

10mL of 0.1moldm−3Na2​SO4​