Potassium is vital in the human body, and potassium chloride by mouth is the common means to treat low blood potassium, although it can also be given intravenously. Exercises on concentrations and dilutions - LBU - StuDocu. Formula weights are especially useful in determining the relative weights of reagents and products in a chemical reaction. Molecular weight calculation: 39.0983 + 35.453 ›› Percent composition by element This compound is also known as Potassium Chloride. Potassium chloride (also known as KCl or potassium salt) is a metal halide salt composed of potassium and chlorine. Solution Composition. © copyright 2003-2020 Study.com. {/eq}, {eq}molality\:=\frac{25.0\:grams\:KCl\:\left(\frac{1\:mol\:KCl}{74.55\:grams}\right)}{250\:mL\:\left(\frac{1\:gram}{1\:mL}\right)\left(\frac{1\:kg}{1000\:grams}\right)} {/eq}. Calculate the molecular weight Whereas KCl components were formerly used for infrared optics, it has been entirely replaced by much tougher crystals such as zinc selenide. Using the chemical formula of the compound and the periodic table of elements, we can add up the atomic weights and calculate molecular weight of the substance. Browse the list of Potassium chloride is extracted from minerals sylvite, carnallite, and potash. We need to assume that water has a density of 1 gram/mL. molar mass and molecular weight. 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This compound is also known as Potassium Chloride. The crystal structure of potassium chloride is like that of NaCl. Electrolysis (used for sodium) fails because of the high solubility of potassium in molten KCl.[9]. The vast majority of potassium chloride is produced as agricultural and industrial grade potash in Saskatchewan, Canada, as well as Russia and Belarus. It is odorless and has a white or colorless vitreous crystal appearance. The molar mass for KCl is 74.55 grams/mol. It occurs naturally as the mineral sylvite, and in combination with sodium chloride as sylvinite.[9]. We will use the molar mass of KCl to convert the grams of KCl to moles. The percentage by weight of any atom or group of atoms in a compound can be computed by dividing the total weight of the atom (or group of atoms) in the formula by the formula weight and multiplying by 100. It is also used in various brands of bottled water, as well as in bulk quantities for fossil fuel drilling purposes. [citation needed]. The typical amounts of potassium chloride found in the diet appear to be generally safe. The resulting salt can then be purified by recrystallization. in the Skiatron. How many grams of KCl are present in 250.0 mL of a 0.125 M solution? Because potash confers excellent clarity to glass, it is commonly used in eyeglasses, glassware, televisions, and computer monitors. It is also extracted from salt water and can be manufactured by crystallization from solution, flotation or electrostatic separation from suitable minerals. There are also a small number of 511 keV gamma rays from positron annihilation which can be used to calibrate medical scanners. As with other compounds containing potassium, KCl in powdered form gives a lilac flame. Example Reactions: • AgNO3 + KCl = AgCl↓+ KNO3. Convert grams KCl to moles or moles KCl to grams. Name: Potassium Chloride. of a chemical compound, More information on [Use molar mass: KCl, 74.55 g/mol] It is rated for B and C fires. For this reason, it is used in surgical abortion, and as the third and final drug delivered in the lethal injection process. Potassium chloride is commonly used in the practice of execution by lethal injection. Intravenously, the LD50 of potassium chloride is far smaller, at about 57.2 mg/kg to 66.7 mg/kg; this is found by dividing the lethal concentration of positive potassium ions (about 30 to 35 mg/kg)[15] by the proportion by mass of potassium ions in potassium chloride (about 0.52445 mg K+/mg KCl). The formula weight is simply the weight in atomic mass units of all the atoms in a given formula. The concentration of the KCl solution is 1.34 m. Our experts can answer your tough homework and study questions.

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