Question: The amount of ascorbic acid (vitamin C; C6H8O6) in tablets is determined by reaction with bromine and then titration of the hydrobromic acid with standard base: C6H8O6+Br2→C6H6O6+2HBrHBr+NaOH→NaBr+H2OA certain tablet is advertised as containing 500 mg of vitamin C. One tablet was dissolved in water and reacted with Br2. The solution was then titrated with 43.20 mL of 0.1350 M NaOH. Did the tablet contain the advertised quantity of vitamin C?

Q4.140CP - Chemistry: Molecular Nature Of Matter And Change

Q4.140CP

Question

Question: The amount of ascorbic acid (vitamin C; C₆H₈O₆) in tablets is determined by reaction with bromine and then titration of the hydrobromic acid with standard base:

$C_{6} H_{8} O_{6} + B r_{2} \to C_{6} H_{6} O_{6} + 2 H B r H B r + N a O H \to N a B r + H_{2} O$

A certain tablet is advertised as containing 500 mg of vitamin C. One tablet was dissolved in water and reacted with Br₂. The solution was then titrated with 43.20 mL of 0.1350 M NaOH. Did the tablet contain the advertised quantity of vitamin C?

Step-by-Step Solution

Verified

Answer

Answer: Yes, the tablet contains the advertised quantity of vitamin C.

1Step 1: Overall reaction

The given reactions are,

$C_{6} H_{8} O_{6} + B r_{2} \to C_{6} H_{6} O_{6} + 2 H B r H B r + N a O H \to N a B r + H_{2} O$

The overall reaction for above reactions is,

$C_{6} H_{8} O_{6} + B r_{2} \to C_{6} H_{6} O_{6} + 2 H B r H B r + N a O H \to N a B r + H_{2} O_________________________________________C_{6} H_{8} O_{6} + B r_{2} + N a O H \to C_{6} H_{6} O_{6} + H B r + N a B r + H_{2} O$