For a 50ml beaker, 0.4532g of pure iron III oxide was weighed, to which 1 ml of a concentrated hydrochloric acid solution was added and then 20 ml of deionized water was added to the beaker. After mixing, the resulting solution was transferred to a 50.00 ml flask and the volume was made up with deionized water. Then 15ml of this solution into a second beaker to which 10ml of an iron iii chloride solution of 0.200 M concentration was added. Calculate the final concentration of the iron iii cation solution expressed in mol/L and in g/L, considering that the volumes are additive.

A sample containing a mixture of CuCl2(s) and KCI(s) with a mole fraction of 13.8% KCI was dissolved in water. An excess of AgNO3(s) is added to the mixture, resulting in the chloride being precipitated as AgCl(s). The AgCl(s) is collected and dried, weighed to have a mass of 8.40g. Calculated the masses of KCI(s) and CuCl2(s) in the original mixture.

The total cation content of natural water is often determined by exchanging the cations for hydrogen ions on a strong acid ion-exchange resin. A 25.00 mL sample of a natural water was diluted to 100.00 ML with distilled water, and 2.06 g of a cation - exchange resin was added. After stirring, the mixture was filtered and the solid remaining on the filter paper was washed with three 15.00 mL portions of water. The filtrate and washings required 16.30 mL of 0.0282 M NaOH to give a bromocresol green end point. a) Calculate the number of millimoles of cation present in exactly 1.00 L of sample.  b ) Report the results in terms of milligrams of CaCO3 per liter. Only typed solution.

A student carries out the following experiments and records the following observations.  1.  A few drops of a solution of KOH (aq) is added to a solution of Cu(NO3)2 (aq).  A blue gelatinous solid forms immediately upon addition.   2.   A few drops of a solution of KOH (aq) is added to a solution of NaNO3 (aq).  No changes are observed.  3.  A few drops of a solution of KOH (aq) is added to an unknown solution that could contain Cu2+(aq) and/or Na+(aq) ions (the solution could contain both ions, just one of the ions, or neither ions).  A blue gelatinous solid forms immediately upon addition.   Select all of the answers that are consistent with the data from those 3 experiments.  Group of answer choices The unknown contains Cu2+(aq) and Na+(aq) The unknown contains Cu2+(aq) The unknown contains Na+(aq) The unknown contains neither Cu2+(aq) or Na+(aq)