The best way to extend the life of a gas chromatography (GC) capillary column is to not foul it in the first place. It is important to pay close attention to sample preparation to remove as many nonvolatile or less-volatile matrix components as possible. The best way to prolong your gas chromatography column life is …
Gas Chromatography (GC) Capillary Columns : Care and Maintenance Read More »
Overview A 50% solution of sodium hydroxide is a clear and colorless liquid. It is available is in premade format from a number of suppliers1-3. It causes severe skin burns and eye damage. The solution may be corrosive to metals. The following are know characteristics of the solution. Density of Sodium Hydroxide = 1.515 g/mlMolecular …
As HPLC chemists we know that columns do have a finite lifetime. You column life time (total number of samples you can run) is dependent on factors such as: the mode of separation the type of packing on the column the type of stationary phase Column care Increase Your Column’s Lifetime While most of these …
Density of H2SO4 = 1.84g/mL Molecular weight of H2SO4 = 98.079 95 ml H2SO4 equals 95 x 1.84 = 174.8 g of H2SO4 Hence, 100 ml 95% H2SO4 volume contains 174.8 g H2SO4. And, 1 liter volume of 95% H2SO4 contains 1748.0 g of H2SO4 So, the molarity of 95% H2SO4 is 1748.0/98.079 = 17.822 …
Overview Preparation Step 1: Calculate the volume of 100 grams of Hydrochloric acid. Formula: Density = weight / volume or Volume = weight / density Volume of 100 gram of Hydrochloric acid = 100/1.2 = 83.33 ml Note: 37% (w/w) Hydrochloric acid means that 100 grams of Hydrochloric acid contain 37 …
Chemical Name Molecular Formula Molecular Weight (g/mol) Equivalent Weight (g/equiv) Acetic Acid CH3COOH 60.05 60.05 Ammonium Sulfate (NH4)2SO4 132.14 132.14 Calcium Carbonate CaCO3 100.09 50.05 Citric Acid C6H8O7 192.12 64.04 Citric Acid (monohydrate) C6H8O7. H2O 210.14 70.05 Hydrochloric Acid HCl 36.46 36.46 Lactic Acid C3H6O3 90.08 90.08 Malic Acid C4H6O5 134.09 67.05 Nitric Acid HNO3 …
Molecular and Equivalent Weights of Common Compounds Read More »
Overview Calculation procedure Parameter Value Required volume 1000 mL Molecular weight of NaOH 39.997 g/mole Concentration of 0.25 M Sodium Hydroxide 0.9999% (% by mass, wt/wt) Preparation Step 1: Find out how many g of Sodium Hydroxide you need. Formula: (0.25 mol/L) * (39.997 g/mol) = 9.9992 g of Sodium Hydroxide in 1 L. So …
Preparation of 0.25 M Sodium Hydroxide (NaOH) Solution Read More »
