"In the process of lime softening, calcium hydroxide (Ca(OH)2) is added to hard water to remove dissolved calcium, thereby 'softening' the water. How is it possible that adding calcium hydroxide to hard water can result in a net reduction in the concentration of Ca2+ ions? Explain."

Which has the highest conductivity and why? 0.1 M BaCl2 or 0.1 M NaCl.

(a) Write chemical equations to show what happens when each of the following substances is mixedwith water:(i) Hydride ion(ii) Glucose, C6H12O6(s)(iii) Copper(II) bromide(iv) Formic acid(b) Write chemical equations for the following processes:(i) Chemical reaction for ΔH°f for mercury(I) phosphate.(ii) Thermal dissociation of gaseous bromine.(iii) Sublimation of carbon dioxide.(iv) Reduction of VO2+ to produce VO2+.(v) Neutralization of sulfuric acid by barium hydroxide.(vi) Thermal decomposition of 1 mol of sodium bicarbonate to produce sodium carbonate, carbon dioxide and water

Both the reactant Na2CO3 and the product NaCl are white solids. What chemical tests other than placing drops of HCl, can you use to determine Na2CO3 from NaCl and reactions will you get from each?

Draw tructu f he ajor rganic roduct f he ollowing reaction. CH2 1. Hg(OAc)2, H20 2. NaBH4 CH3 • In cases where there is more than one answer, just draw one. •You do not have to consider stereochemistry. [ド

A sample of river water at 20°C is analyzed and the following parameters are found for it: Phenolphthalein alkalinity = 5.8 ×10-6 M, Total alkalinity = 2.8 × 10-5 M; pH = 8.5 Hardness = 10.0 mg CaCO3/L; [Mg2+] = 3.8 x 10-5 M Calculate the concentrations of [Ca2+], [CO3 2-] and [HCO3 - ] in this water sample.

Determine how to prepare 250.0 mL of 0.000362 M Fe(NH4)2(SO4)2 using solid Fe(NH4)2(SO4)2 • 6H2O (392.13 g/mol).

Grams of solute /100 g H,0 NH, 3 can be supported by the solu- Which inference about bility curves shown? Solubility Curves 150 140 KI 130 120 NANO, KNO 110 100 90 80 HCI NH.CI 70 60 KCI NH, 50 40 NaCI 30 KCIO 20 10 10 20 30 40 50 60 70 80 90 100 Temperature °C

You have been contracted to determine how different salts affect the pH of water. Which of the solids in the following set should you test to investigate for the effects of cations on pH? Rb₂SO3 RbBrO AlBra CH3NH₂Br M9Cz

The state of California has set an upper limit of 50. ppb of chromium (by mass) in drinking water. Suppose you drink the recommended eight 8-ounce glasses of water (1.9 kg of water) with this concentration in one day. How much chromium did you ingest that day?