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Example 2: To prepare a specific volume of a specific molar solution from a dry reagent A chemical has a FW of 180 g/mole and you need 25 ml (0.025 L) of 0.15 M (M = moles/L) solution. How many grams of the chemical must be dissolved in 25 ml water to make this solution? #...
In our Chemistry experiments, we will be asked to prepare solutions of given volumes and concentrations. In order to prepare solutions, we would need to determine the number of moles required for the solution and then multiply it to the molar mass of a reagent to det...
How many grams of NaOH are needed to prepare 350 mL of a 0.400 M NaOH solution? How many grams of NaOH are needed to prepare 300 mL of a 0.38 M NaOH solution? How many grams of NaOH are needed to prepare 250 mL of a 0.80 M NaO...
Prepare Aqua Regia Solution The usualmolarratio between concentrated hydrochloric acid and concentrated nitric acid is HCl:HNO3of 3:1. Keep in mind, concentrated HCl is about 35%, while concentrated HNO3is about 65%, so thevolumeratio is usually 4 parts concentrated hydrochloric acid to 1 part ...
(2) After the above reaction is completed, cool to 60-80℃ and slowly add hydrochloric acid solution to the three-necked flask while stirring. After complete addition, continue stirring for 30-50 minutes. After the reaction is finished, cool to room temperature, filter the precipitate, dissolve...
Put 30 mL of 1 mol/L tin tetrachloride solution, 2 mL of polyethylene glycol, and 2.0 g of urea into a three-neck flask, stir evenly, and slowly add 28% ammonia solution dropwise to adjust the pH of the solution. to 0.25, stir in an 80°C water bath for 8 hours; after cooling ...
M = 0.62 moles NaCl / 0.50 liter solution = 1.2 M solution (1.2 molar solution) Note that I assumed dissolving the 6 grams of salt did not appreciably affect the volume of the solution. When you prepare a molar solution, avoid this problem by adding solvent to your solute to reach a ...
quicker. You have now calculated the concentration of the chemical of interest in three of your diluted unknowns. The original solution was diluted to prepare these unknowns, however, so you now need to work backwards and calculate the concentration of the original solution based on the dilution...
The term "molar solution" refers to the corresponding molarity of a solution. For example, a two molar solution means the molarity of the solution 2 mol/L. Alternatively, it suggests the existence of two moles of solute in one liter of the solution....