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Sr.No. Content Read more 1 Chemistry Website Read More 2 Basic SI Units Read More 3 Physical Constants Read More 4 Prefix used in SI System Read More 5 Acid-Base Indicator Selection Read More 6 Preparation of Standard Solution Read More 7 Concentrations Read More 8 Common Units of Mass & Weight, Length Read More 9 Particle size Conversion Read More
Chemistry Websites Basic SI Units Physical Dimension Symbol for Quantity SI Symbol Name of SI Units Length l m meter Mass m kg kilogram Time t s second Electric current I A ampere Thermodynamic temperature T K Kelvin Amount of substance n Mole mole Luminous intensity lv cd candela
Physical Constants Quantity Symbol Traditional Units SI Units Acceleration of gravity g 980.6 cm/s 9.806 m/s Atomic mass unit amu 1.6606 X 10-24 g 1.6606 X 10-27 kg Avogadro constant Na 6.022 X 1023 particles/mol 6.022 X 1023 particles/mol Boltzmann constant k 1.3807 X10-16 erg/K 1.3807 X 10-23 J/K Charge-to-mass ratio of electron e/m 1.7588 X 108 Coulomb/g 1.7588 X 1011 C/kg Electronic charge e 1.60219 X 10-19 Coulomb 4.8033 X 10-19 esu 1.60219 X 10-19 C Faraday constant F 96,487 C·eq-1 96,487 C·mol-1 Gas constant R 1.987 cal/mol. K 8.3145 kPa dm3/ mol .K 8.3145 J/ mol.K Molar volume (STP) Vm 22.710981 L/mol 22.710981 X 10-3 m3/mol
Prefix used in SI System Multiple Prefix Symbol 10⁻¹⁵ Femto f 10⁻¹² Pico p 10⁻⁹ Nano n 10⁻⁶ Micro µ 10⁻³ Milli m 10⁻² Centi c 10⁻¹ Deci d 10 Deca da 1⁻¹ Hecta h 10³ Kilo k 10⁶ Mega M 10⁹ Giga G 10¹² Tera T 10¹⁵ Peta P
Acid-Base Indicator Selection Name pH range Color Change Thymol Blue 1.2-2.8 Red to Yellow Bromophenol Blue 3.0-4.6 Yellow to Blue Congo Red 3.0-5.0 Blue to Red Bromophenol Blue 3.0-4.5 Yellow to Blue Methyl Orange 3.2-4.2 Red to Yellow/Orange Bromocresol Green 3.8-5.4 Yellow to Blue Methyl Red 4.2-6.2 Pink to Yellow Methyl Red Hydrochloride 4.2-6.2 Pink to Yellow Rosolic Acid 5.0-8.0 Mow to Red Bromocresol Purple 5.2-6.8 Yellow to Purple Alizarin 5.8-7.2 Yellow to Red Bromothymol Blue 6.0-7.6 Yellow to Blue m-Nitrophenol 6.8-8.6 Colorless to Yellow Phenol Red 6.8-8.2 Yellow to Red Cresol Red 7.0-8.8 Yellow to Violet Red Thymol Blue 8.0-9.2 Yellow to Blue Phenolphthalein 8.0-10.0 Colorless to Red Thymolphthalein 8.8-10.5 Colorless to Blue Alizarin 1.0-13.0 Red to Purple Acid Fuchsin 12.0-14.0 Red to Colorless
Acid-Base Indicator Selection Specific Gravity (20°C) Molarity (M) Qualtity required in ml to make Normality (N) Quantity required in ml to make Glacial Acetic acid 1.05 17.4 57.5 17.4 57.5 Ammonia 30% 0.89 14.5 69 14.5 69 Ammonia 25% 0.91 13.4 74.6 13.4 74.6 Hydrochloric acid 36% 1.18 11.7 85.8 11.7 85.8 Hydrofluoric acid 40% 1.13 22.6 44.2 22.6 44.2 Hydrofluoric acid 48% 1.15 28.9 34.5 28.9 34.5 Nitric acid 70% 1.42 15.8 63.3 15.8 63.3 Perchloric acid 60% 1.54 9.2 108.7 9.2 108.7 Perchloric acid 70% 1.67 11.6 86.2 11.6 86.2 Sulphuric acid 98% 1.84 18 53.1 36 26.2 Phosphoric acid 85% 1.7 15.2 65.8 45.6 21.9
Concentrations Percentage (%) Part per Million (ppm) Part per Billion (ppb) Part per Trillion (ppt) 1 10,000 10,000,000 10,000,000,000 0.1 1,000 1,000,000 1,000,000,000 0.0001 1 1,000 1,000,000 0.0000001 0.001 1 1,000 0.0000000001 0.000001 0.001 1 0.0000000000001 0.000000001 0.000001 0.001
Common Units of Mass & Weight 1 pound = 453.5924 grams 0.45359 kilograms 7000 grains 1 kilogram = 1000 grams 2.205 pounds - 1 gram = 10 decigrams 100 centigrams 1000 milligrams 1 metric ton = 1000 kilograms 2204.62 pounds -
Common Units of Length 1 inch = 2.54 centimeters - - - 1 mile = 5280 feet 1.609 kilometers 0.3048 meters - 1 mile = 5280 feet 1.609 kilometers - - 1 yard = 36 inches 0.9144 meter - - 1 meter = 100 centimeters 39.37 inches 3.281 feet 1.094 yards 1 kilometer = 1000 meter 1094 yards 0.6215 mile - 1 angstrom = 1.0 X 10-8 centimeter 0.10 nanometer 1.0 X 10-10 meter -