Question

8. White short notes on any two of the following.
Metalion indications
b) Volhard's method,
c) Primary and secondary standards,
निम्नांकित में से किन्हीं दो पर लघु टिप्पणी लिखिए।
अ) धातुआयन संसूचक
ब) बोलहर्ड विधि
स) प्राथमिक व द्वितियक मानक​

Answer 1

Answer:

b. volhards method:This method uses a back titration with potassium thiocyanate to determine the concentration of chloride ions in a solution. Before the titration an excess volume of a silver nitrate solution is added to the solution containing chloride ions, forming a precipitate of silver chloride.

c. primary and secondary .tandard  Secondary standard is a chemical that has been standardized against a primary standard for use in a specific analysis. Secondary standards are commonly used to calibrate analytical methods. ... It is usually standardized against a primary standard.

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