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preface to fifteenth edition

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11.112 SECTION 11<br />

Bromchlorophenol blue, dibromodichlorophenol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in<br />

8.6 mL 0.02 N NaOH and dilute with water <strong>to</strong> 250 mL; pH range yellow 3.2–4.8 blue.<br />

Bromcresol green, tetrabromo-m-cresol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 7.15 mL<br />

0.02 N NaOH and dilute with water <strong>to</strong> 250 mL; or, 0.1 g in 100 mL 20% alcohol; pH range<br />

yellow 4.0–5.6 blue.<br />

Bromcresol purple, dibromo-o-cresol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 9.5 mL 0.02<br />

N NaOH and dilute with water <strong>to</strong> 250 mL; or, 0.1 g in 100 mL 20% alcohol; pH range yellow<br />

5.2–6.8 purple.<br />

Bromine water, saturated solution: <strong>to</strong> 400 mL water add 20 mL of bromine; use a glass s<strong>to</strong>pper<br />

coated with petrolatum.<br />

Bromphenol blue, tetrabromophenol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 7.45 mL 0.02<br />

N NaOH and dilute with water <strong>to</strong> 250 mL; or, 0.1 g in 100 mL 20% alcohol; pH range yellow<br />

3.6–4.6 violet-blue.<br />

Bromphenol red, dibromophenol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 9.75 mL 0.02 N<br />

NaOH and dilute with water <strong>to</strong> 250 mL; pH range yellow 5.2–7.0 red.<br />

Bromthymol blue, dibromothymol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 8.0 mL 0.02 N<br />

NaOH and dilute with water <strong>to</strong> 250 mL; or, 0.1 g in 100 mL of 20% alcohol; pH range yellow<br />

6.0–7.6 blue.<br />

Brucke’s reagent (protein precipitant): dissolve 50 g of KI in 500 mL of water, saturate with<br />

HgI 2 (about 120 g), and dilute <strong>to</strong> 1 liter.<br />

Cadmium chloride, CdCl290.5N: 46gper liter.<br />

Cadmium nitrate,<br />

Cadmium sulfate,<br />

Calcium chloride,<br />

Calcium hydroxide,<br />

Calcium nitrate,<br />

Cd(NO) ·4HO90.5N: 77g<br />

3 2 2<br />

CdSO · 4H O90.5N: 70g<br />

4 2<br />

CaCl · 6H O90.5N: 55g<br />

2 2<br />

Ca(OH) 90.04N: 10g<br />

2<br />

Ca(NO ) · 4H O90.5N: 59g<br />

3 2 2<br />

per liter.<br />

per liter.<br />

per liter.<br />

per liter for saturation.<br />

per liter.<br />

Calcium sulfate, CaSO 4· 2H2O90.03N:<br />

mechanically stir 10 g in a liter of water for 3 hours;<br />

decant and use the clear liquid.<br />

Carbon disulfide, CS 2 : commercial grade which is colorless.<br />

Chloride reagent: dissolve 1.7 g of AgNO 3 and 25 g KNO 3 in water, add 17 mL of concentrated<br />

NH 4 OH and make up <strong>to</strong> 1 liter with water.<br />

Chlorine water, saturated solution: pass chlorine gas in<strong>to</strong> small amounts of water as needed;<br />

solutions deteriorate on standing.<br />

Chloroform, CHCl 3 : commercial grade.<br />

Chloroplatinic acid, H2PtCl 6· 6H2O910% solution: dissolve 1gin 9mLof water; keep in a<br />

dropping bottle.<br />

Chlorphenol red, dichlorophenol-sulfonphthalein (indica<strong>to</strong>r): dissolve 0.1 g in 11.8 mL 0.02 N<br />

NaOH and dilute with water <strong>to</strong> 250 mL; or, 0.1 g in 100 mL 20% alcohol; pH range yellow 5.2–<br />

6.6 red.<br />

Chromic chloride, CrCl390.5N: 26gper liter.<br />

Chromic nitrate,<br />

Chromic sulfate,<br />

Cobal<strong>to</strong>us nitrate,<br />

Cr(NO ) 90.5N: 40g<br />

3 3<br />

per liter.<br />

Cr (SO ) · 18H O90.5N: 60g<br />

2 4 3 2<br />

Co(NO ) · 6H O90.5N: 73g<br />

3 2 2<br />

per liter.<br />

per liter.

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