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preface to fifteenth edition

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11.110 SECTION 11<br />

Alizarin yellow GG, salicyl yellow, sodium m-nitrobenzeneazosalicylate (indica<strong>to</strong>r): dissolve<br />

0.1 g in 100 mL 50% alcohol; pH range yellow 10.0–12.0 lilac.<br />

Alizarin S, alizarin carmine, sodium alizarin sulfonate (indica<strong>to</strong>r): dissolve 0.1 g in 100 mL<br />

water; pH range yellow 3.7–5.2 violet.<br />

Aluminon (qualitative test for aluminum). The reagent consists of 0.1% solution of the ammoniumsalt<br />

of aurin tricarboxylic acid. A bright red precipitate, persisting in alkaline solution,<br />

indicates aluminum.<br />

Aluminum chloride, AlCl390.5N: 22gper liter.<br />

Aluminum nitrate,<br />

Aluminum sulfate,<br />

Ammonium acetate,<br />

Al(NO ) · 7.5H O90.5N: 58g<br />

3 3 2<br />

Al (SO ) · 18H O90.5N: 55g<br />

2 4 3 2<br />

NH C H O 93N: 231 g<br />

4 2 3 2<br />

per liter.<br />

per liter.<br />

per liter.<br />

Ammonium carbonate, (NH)CO 4 2 3·HO93N: 2 171 g per liter; for the anhydrous salt: 144 g<br />

per liter.<br />

Ammonium chloride, NH4Cl93N: 161 g per liter.<br />

Ammonium hydroxide, NH4OH915N:<br />

the concentrated solution which contains 28% NH 3 ;<br />

for 6N: 400 mL per liter.<br />

Ammonium molybdate, (NH 4) 2MoO49N: dissolve 88.3 g of solid (NH 4) 6Mo7O 24 · 4H2O<br />

in<br />

100 mL 6N NH 4 OH. Add 240 g of solid NH 4 NO 3 and dilute <strong>to</strong> 1 liter. Another method is <strong>to</strong> take<br />

72 g of MoO 3 , add 130 mL of water and 75 mL of 15N NH 4 OH; stir mechanically until nearly<br />

all has dissolved, then add it <strong>to</strong> a solution of 240 mL concentrated HNO 3 and 500 mL of water;<br />

stir continuously while solutions are being mixed; allow <strong>to</strong> stand 3 days, filter, and use the clear<br />

filtrate.<br />

Ammonium nitrate, NH4NO39N: 80gper liter.<br />

Ammonium oxalate,<br />

(NH ) C O · H O90.5N: 40g<br />

4 2 2 4 2<br />

per liter.<br />

Ammonium polysulfide (yellow ammonium sulfide), (NH 4 ) 2 S x : allow the colorless (NH 4 ) 2 S<strong>to</strong><br />

stand, or add sulfur.<br />

Ammonium sulfate, (NH 4) 2SO490.5N: 33 g per liter; saturated: dissolve 780 g of (NH 4 ) 2 SO 4<br />

in water and make up <strong>to</strong> a liter.<br />

Ammonium sulfide (colorless), (NH 4) 2S9saturated:<br />

pass H 2 S through 200 mL of concentrated<br />

NH 4 OH in the cold until no more gas is dissolved, add 200 mL NH 4 OH and dilute with water<br />

<strong>to</strong> a liter; the addition of 15 g of sulfur is sufficient <strong>to</strong> make the polysulfide.<br />

Antimony pentachloride,<br />

Antimony trichloride,<br />

SbCl 90.5N: 39g<br />

5<br />

SbCl 90.5N: 38g<br />

3<br />

per liter.<br />

per liter.<br />

Aqua regia: mix 3 parts of concentrated HCl and 1 part of concentrated HNO 3 just before ready<br />

<strong>to</strong> use.<br />

Arsenic acid,<br />

Arsenous oxide,<br />

Aurichloric acid,<br />

H AsO · 0.5H O90.5N ( 1<br />

3 4 2 ⁄2H3AsO4<br />

5):15g<br />

As O 90.25N: 8g<br />

2 3<br />

HAuCl · 3H O:<br />

4 2<br />

per liter for saturation.<br />

dissolve in ten parts of water.<br />

per liter.<br />

Aurin, see rosolic acid.<br />

Azolitmin solution (indica<strong>to</strong>r); make up a 1% solution of azolitmin by boiling in water for 5<br />

minutes; it may be necessary <strong>to</strong> add a small amount of NaOH <strong>to</strong> make the solution neutral; pH<br />

range red 4.5–8.3 blue.

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