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Copyright © Tarek Kakhia. All rights reserved. http://tarek.kakhia.org concentration depends on the atmospheric pressure when it is prepared . Hydrochloric acid is frequently used in chemical analysis to prepare ( " digest " ) samples for analysis. Concentrated hydrochloric acid dissolves many metals and forms oxidized metal chlorides and hydrogen gas, and it reacts with basic compounds such as calcium carbonate or copper (II) oxide, forming the dissolved chlorides that can be analyzed . 4 . Physical properties The physical properties of hydrochloric acid, such as boiling and melting points, density, and pH depend on the concentration or molarity of H Cl in the acid solution. They range from those of water at very low concentrations approaching 0% HCl to values for fuming hydrochloric acid at over 40 % HCl . Specific heat Vapor pressure Boiling point Melting point Concentration Density Molarity Viscosity kg HCl / kg 10 % 20 % 30 % 32 % 34 % 36 % 38 % Mol / dm3 · K) kg HCl/m3 kJ / ( kg Baumé Kg / l mPa·s Pa °C °C 104.80 6.6 219.60 13 344.70 19 370.88 20 397.46 21 424.44 22 451.82 23 1.048 1.098 1.149 1.159 1.169 1.179 1.189 2.87 1.16 6.02 1.37 9.45 1.70 10.17 1.80 10.90 1.90 11.64 1.99 12.39 2.10 3.47 0.527 103 −18 2.99 27.3 108 −59 2.60 1,410 90 −52 2.55 3,130 84 −43 2.50 6,733 71 −36 2.46 14,100 61 −30 2.43 28,000 48 −26 Hydro chloric acid as the binary ( two – component ) mixture of HCl and H2O has a constant - boiling azeo trope at 20.2 % HCl and 108.6 °C . There are four constant - crystallization eutectic points for hydrochloric acid, between the crystal form of HCl·H2O ( 68 % HC ), HCl·2H2O ( 51 % HCl ), HCl·3H2O ( 41% HCl ), HCl·6H2O ( 25 % HCl ), and ice (0 % HCl). There is also a meta stable eutectic point at 24.8 % between ice and the HCl·3H2O crystallization . 27PDF Image | Chlorine Characteristics
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