121 



TABLE 120.— DENSITIES AND MELTING AND BOILING POINTS OF 

 INORGANIC COMPOUNDS (concluded) 



Density 



about Melting Boiling Pressure 



Substance Chemical formula 20 9 C point, °C point, °C mmHg 



Mercurous chloride Hg 2 Cl 2 7.10 302± 384 



Nickel carbonyl NiC 4 4 1.32 —25 43 760 



nitrate Ni((N0 3 ) 2 + 6 H 2 ... 2.05 56.7 136.7t 760 



oxide NiO 6.69 2090 



Nitric acid HN0 3 1.502 — 42 86 760 



anhydride N 2 5 1.64 30 48 1 760 



oxide NO -^J63.6 —151.8 760 



peroxide N 2 4 1.49 — 9.3 21.3t 760 



Nitrous anhydride N 2 3 1.45 —102 3.5t 760 



oxide N 2 —102.4 3.5 1 760 



Phosphoric acid (ortho) . . . H 3 P0 4 1.83 42.45 



Phosphorous acid H 3 P0 3 1.65 73.6 



disulfide P 3 S 6 298 33711 760 



oxychloride .. POCl 3 1.68 1.3 108 760 



pentasulfide .. P 2 S 5 2.03 276 514 760 



trichloride . . PC1 3 1.57 — 91 75.5 750 



trisulfide .... P 4 S 3 2.03 172.5 407.5 760 



Potassium acid phosphate.. KH 2 P0 4 2.34 252.6 1 



carbonate K 2 C0 3 2.43 891 



chlorate KC10 3 2.34 368.4 400 1 



chloride KC1 1.99 776 1500 760 



chromate K 2 Cr0 4 2.72 968.3 t 



cyanide KCN 1.52 634 



dichromate .... K 2 Cr 2 7 2.69 398 



hydroxide KOH 2.04 360 1320 760 



nitrate KN0 3 2.10 334 400t 



perchlorate .... KC10 4 2.52 610 410 1 760 



sulfate K 2 S0 4 2.66 1076 t 



Silver chloride AgCl 5.56 455 1550 



nitrate AgNO, 4.35 212 444t 



perchlorate AgC10 4 2.81 486 1 



phosphate Ag 3 P0 4 6.37 849 



metaphosphate AgP0 3 482 



sulfate AgS0 4 5.45 652 1085t 



Sodium carbonate Na 2 C0 3 2r51 851 t 



chlorate NaC10 3 2.48 248 t 



chloride NaCl 2.17 801 1413 760 



hydroxide NaOH 2.13 318 



hyposulfite Na 2 O t + 2 H*0 52 t t 760 



subl. 



metaphosphate ... NaPO, 2.18 640 >1100 



nitrate NaNO. 2.26 310 380t 



perchlorate NaC10 4 2.53 482 1 t 



pyrophosphate ... Na 4 P 2 0, 2.45 880 



sulfate Na 2 S0 4 2.67 884 t 



sulfate Na 2 SO 4 + 10H 2 O ....1.46 32.88 



tetraborate Na 2 B 4 7 2.36 741 1570 760 



Sulfur dioxide S0 2 — 72.7 — 10 760 



trioxide SCU 1.91 16.8 44.9 760 



Sulfuric acid H 2 S0 4 1.83 10.5 338 1 760 



acid H 2 S0 4 + H 2 1.79 8.61 290 1 760 



acid (pyro) H 2 S 2 7 1.89 35 t 



Tin, stannic chloride SnCl 4 2.23 — 33 114 760 



stannous chloride .... SnCl 2 3.39(245°j246 623 760 



Water H 2 0.998 100 760 



Zinc chloride ZnCl 2 2.91 262 732 760 



nitrate Zn(N0 3 ) 2 + 6 H 2 .... 2.06 36.4t 131 760 



sulfate ZnS0 4 + 7H 2 1.97 39 1 t 



II At 10.5 mmHg pressure. 



SMITHSONIAN PHYSICAL TABLES 



