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preface to fifteenth edition

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11.120 SECTION 11<br />

until the ammonium salt is decomposed. The solution is evaporated <strong>to</strong> dryness and the residue<br />

is dissolved in 10% HNO 3 .<br />

Stannic chloride,<br />

SnCl 90.5N: 33g<br />

4<br />

per liter.<br />

Stannous chloride, SnCl 2· 2H2O90.5N: 56gper liter. The water should be acid with HCl and<br />

some metallic tin should be kept in the bottle.<br />

Starch solution (iodine indica<strong>to</strong>r): dissolve 5gof soluble starch in cold water, pour the solution<br />

in<strong>to</strong> 2 liters of water and boil for a few minutes. Keep in a glass-s<strong>to</strong>ppered bottle.<br />

Starch solution (other than soluble): make a thin paste of the starch with cold water, then stir<br />

in 200 times its weight of boiling water and boil for a few minutes. A few drops of chloroform<br />

added <strong>to</strong> the solution acts as a preservative.<br />

S<strong>to</strong>ke’s reagent: dissolve 30 g of ferrous sulfate and 20 g of tartaric acid in water and dilute <strong>to</strong><br />

1 liter. When required for use, add strong ammonia until the precipitate first formed is dissolved.<br />

Strontium chloride, SrCl 2· 6H2O90.5N: 67gper liter.<br />

Strontium nitrate,<br />

Strontium sulfate,<br />

Sr(NO ) 90.5N: 53g<br />

3 2<br />

SrSO : 4<br />

per liter.<br />

prepare a saturated solution.<br />

Sulfanilic acid (for detection of nitrites): dissolve 8gof sulfanilic acid in 1 liter of acetic acid<br />

(sp. gr. 1.04).<br />

Sulfuric acid, HSO95N: 2 4 245 g per liter, sp. gr. 1.153.<br />

Sulfurous acid, H 2 SO 3 : saturate water with sulfur dioxide.<br />

Tannic acid: dissolve 1gtannic acid in 1mLalcohol and make up <strong>to</strong> 10mLwith water.<br />

Tartaric acid, H 2 C 4 H 4 O 6 : dissolve one part of the acid in 3 parts of water; for a saturated solution<br />

dissolve 750 g of tartaric acid in water and dilute <strong>to</strong> 1 liter.<br />

Tetrabromophenol blue, tetrabromophenol-tetrabromosulfonphthalein (indica<strong>to</strong>r): dissolve<br />

0.1 g in 5 mL 0.02N NaOH and dilute with water <strong>to</strong> 250 mL; pH range yellow 3.0–4.6 blue.<br />

Thymol blue, thymol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 10.75 mL 0.02N NaOH and<br />

dilute with water <strong>to</strong> 250 mL; or dissolve 0.1 g in 20 mL warmalcohol and dilute with water <strong>to</strong><br />

100 mL; pH range (acid) red 1.2–2.8 yellow, and (alkaline) yellow 8.0–9.6 blue.<br />

Thymolphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 100 mL alcohol; pH range colorless 9.3–10.5<br />

blue.<br />

Tincture of iodine (antiseptic): add 70 g of iodine and 50 g of KI <strong>to</strong> 50 mL of water; make up<br />

<strong>to</strong> 1 liter with alcohol.<br />

o-Tolidine solution (for residual chlorine in water analysis): dissolve 1gof pulverized o-<strong>to</strong>lidine,<br />

m.p. 129C., in 1 liter of dilute hydrochloric acid (100 mL conc. HCl diluted <strong>to</strong> 1 liter).<br />

Toluylene red (indica<strong>to</strong>r): see neutral red.<br />

Trichloroacetic acid: dissolve 100 g of the acid in water and dilute <strong>to</strong> 1 liter.<br />

Trinitrobenzene, 1,3,5-trinitrobenzene (indica<strong>to</strong>r): dissolve 0.1 g in 100 mL alcohol; pH range<br />

colorless 11.5–14.0 orange.<br />

Trinitrobenzoic acid, 2,4,6-trinitrobenzoic acid (indica<strong>to</strong>r): dissolve 0.1 g in 100 mL water; pH<br />

range colorless 12.0–13.4 orange-red.<br />

Tropeolin D (indica<strong>to</strong>r): see methyl orange.<br />

Tropeolin O, sodium2,4-dihydroxyazobenzene-4-sulfonate (indica<strong>to</strong>r): dissolve 0.1 g in<br />

100 mL water; pH range yellow 11.0–13.0 orange-brown.

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