Preparation of Boric Acid

Question 1

Color of Boric acid

Answer 1

colorless

Question 2

Odor of Boric acid

Answer 2

odorless

Question 3

taste of Boric acid

Answer 3

sour

Question 4

Boric acid reaction to litmus paper

Answer 4

red to red, blue to red

Question 5

Tumeric paper test for boric acid

Answer 5

Brownish black

Question 6

Boric acid + NH4OH

Answer 6

Greenish black

Question 7

Methanol-sulfuric acid test of boric acid

Answer 7

Green border flame

Question 8

Test for impurities for boric acid

Answer 8

Clear solution

Question 9

Conclusion for test for impurities of boric acid

Answer 9

Absence water insoluble subs

Question 10

Reagent for Na test for boric acid

Answer 10

KH2SbO2

Question 11

Reagent for Cl test for boric acid

Answer 11

AgNO3

Question 12

Results for + KH2SbO2

Answer 12

(-)

Question 13

Results for + AgNO3

Answer 13

(-)

Question 14

HCl is used instead of sulfuric acid because:

Answer 14

HCl is a soluble acid hence residual traces of HCl will not remain in crystal surfaces while H2SO4 is non-soluble acid and less easily removed

Question 15

Test of washings for chloride ions:

Answer 15

Addition of AgNO3 (no ppt indicates absence of Clions)

Question 16

Cold water is used for washings the crystals since:

Answer 16

Because it is less soluble in cold water

Question 17

Therapeutic use of boric acid:

Answer 17

 Eyewash (collyria)
 Bacteriostatic agent
 Buffer component

Question 18

Official solution before ophthalmic prep:

Answer 18

Since the solution might crystallized and will be irritating to the
eyes

Question 19

Boric acid forms:

Answer 19

Crystalline since it will dissolve thoroughly, with powder form-
tends to float on top of aqueous solvent