a) A 3.071-g portion of a copper(II) salt was dissolved in a 250-mL volumetric flask. A 50.0-mL aliquot was analyzed by adding 1 g of KI and titrating the liberated iodine with 23.80 mL of 0.04684 M Na2S2O3. Find the weight percent of Cu in the salt.
b) Should starch indicator be added to this titration at the beginning or just before the end point?
a) A 3.071-g portion of a copper(II) salt was dissolved in a 250-mL volumetric flask. A...
a 25.0 ml aliquot of vinegar was diluted to 250 ml in volumetric flask. Titration of 50.0 ml aliquots of diluted solution required an average of 34.88 ml of 0.09600 M NaOH. Express the acidity of the vinegar in terms of percentage (w/v) of acetic acid.
A 10.00-g sample that contains an analyte is transferred to a 250-mL volumetric flask and diluted to volume. When a 10.00 mL aliquot of the resulting solution is diluted to 25 ml it gives a signal of 0.235 (arbitrary units). A second 10.00 mL portion of the solution is spiked with 10.00 mL of a 1.00-ppm standard solution of the analyze and diluted to 25.00 mL. The signal for the spiked sample is 0.502. Calculate the weight percent of analyte...
20.5 g of chromic acid are dissolved in a 250 mL volumetric flask. a) what is the concentration of the solution? b) If 10.1 mL of the solution in a) is diluted with 75.5 mL of water, what is the resulting concentration? c) If 20.5 mL of the chromic acid solution in a) are titrated with 25.0 mL of sodium hydroxide solution, what is the molarity of the NaOH solution? (need balanced equation)
20.5 g of chromic acid are dissolved in a 250 mL volumetric flask. a) what is the concentration of the solution? b) If 10.1 mL of the solution in a) is diluted with 75.5 mL of water, what is the resulting concentration? c) If 20.5 mL of the chromic acid solution in a) are titrated with 25.0 mL of sodium hydroxide solution, what is the molarity of the NaOH solution? (need balanced equation)
A penny having a mass of 2.5340 g was dissolved in 20 mL of 8 M HNO3. The resulting solution was transferred to a 100.00-ml volumetric flask and diluted to the mark with water. Then, a sample solution was prepared by transferring 10.00 mL of this solution to a 25.00- ml volumetric flask, adding 2.00 mL of 15 M NH3 and diluting to the mark with waterThe concentration of [Cu(NH3)4]2+ in the sample solution (determined using a Spectro Vis spectrophotometer)...
0.3926 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 4.00 mL of this solution is pipetted into a 50.0 mL volumetric flask and diluted with water to the mark. What is the final salicylic acid concentration?
0.3856 g of salicylic acid is dissolved in water and made up to 250.0 mL in a volumetric flask. Then, 3.00 mL of this solution is pipetted into a 50.0 mL volumetric flask and diluted with water to the mark. What is the final salicylic acid concentration?
A student weighs out 14.6 g of AlBrz, transfers it to a 300 mL volumetric flask, adds enough water to dissolve the solid and then adds water to the 300 mL mark on the neck of the flask. Calculate the concentration (in molarity units) of aluminum bromide in the resulting solution? Calculate the mass, in grams of sodium iodide that must be added to a 250 mL volumetric flask in order to prepare 250 mL of a 0.138 M aqueous...
In the laboratory you dissolve 17.7 g of copper(II) fluoride in a volumetric flask and add water to a total volume of 250 . mL. What is the molarity of the solution? M
1. A 0.7336-g sample of an alloy containing copper and zinc is dissolved in 8 M HCl and diluted to 100 mL in a volumetric flask. In one analysis, the zinc in a 25.00-mL portion of the solution is precipitated as ZnNH4PO4, and subsequently isolated as Zn2P2O7, yielding 0.1163 g. The copper in a separate 25.00-mL portion of the solution is treated to precipitate CuSCN, yielding 0.1931 g. Calculate the %w/w Zn and the %w/w Cu in the sample.