It was found that an equilibrium solution contained 3.00 x 10-4 M Fe3+ (3.00 times 10 to the minus 4th power M Fe 3+), 3.00 x 10-4 M SCN" (3.00 times 10 to the minus 4th power M SCN minus) and 5.00 x 105 M FESCN2+ (5.00 times 10 to the minus 5th power M Fe SCN 2+ ). What is Kc for this solution? 556 0.00234 0.00180 0.000300 0.0000500 750. 9.00 x 10-9 (9.00 times 10 to the minus 9th power)

5. A water supply company, One Team, found out that their water supply had been contaminated with a sparingly soluble magnesium salt. They requested the help of Magent Analytical Laboratory to identify the magnesium salt. They chose to identify this using Ksp determination after narrowing it down to 2 salts: Salt MgCO3 Mg(OH)2 Theoretical Ksp 3.5 x 10-8 1.8 x 10-11 For the standardization of the HCl titrant, 5.230 mg Na2CO3 (98.9% purity, MW = 105.99 g/mol) required 24.4 mL of the titrant to reach the phenolphthalein endpoint. After isolating and precipitating the magnesium salt A, a portion was dissolved in distilled water in order to make a 250.0-mL saturated solution. The titration of a 50.0-mL aliquot of the saturated solution required 8.20 mL of HCl titrant to reach the phenolphthalein endpoint. Meanwhile, dissolving this magnesium salt in 250.0 mL of 0.0200 M MgCl2 required 1.51 mL of the same HCl titrant to titrate a 100.0-mL solution. a. What is the molarity of the HCl titrant?…

1. In this experiment we measured K, for borax Na,B,O,(OH), 8H,0(s)=2Na*(aq)+B,0,(OH),² (aq)+8H,0(1) write down K, for this reaction in terms of reactants/product sp concentrations We measured the concentration of the borate by titrating it with HCl to make boric acid B,O,(OH), (a) + 2 HCI( aq) + 3 H,O(I) → 4 H,BO, + 2CI (ag) the pH at the equivalence point is pH = 4. 2. What indicator did we use, and what color was the indicator at the equivalence point? 3. At 48.2°C, 5.00ml of the saturated solution of bo ax was titrated with 0.235M HCI. It took 23.00 mL of the a id to reach the equivalence point. 1. What is the molarity of the tetra-borate anion in t e solution? 2. What is Kn for borax at this temperature?

What concentration of OH- ions is required to begin the precipitation of Cr(OH)3 from a solution containing 0.250 M Cr3+ ions? Ksp for Cr(OH)3 = 6.7 x 10-31.