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- Given: You weigh out exactly 0.200 g of Fe(NH4)2(SO4)2·6H2O and dissolve it in the 100.00 mL volumetric flask. You then pipette 2.00 mL of this solution into the 50.00 mL volumetric flask to prepare the stock standard tris-bipyridyl-iron(II) solution. a. Calculate the molar concentration of iron(II) in this solution in the 50.00 mL volumetric flask. (The MW of Fe(NH4)2(SO4)2·6H2O is 392.14 g/mol) (answer a given the information above)Potassium Ferrioxalate is mixed with in 50 mL of 1 M H2SO4 In a beaker , it is then placed one-half of this solution in another beaker in the sun and the other half in a cabinet in the dark. the color of both solutions after 0, 5, 15, and 30 minutes are : In the sun it stayed clear the whole 30 min and the sample in the darkness of the cabinet turned light green, Briefly explain your observations in terms of the photochemical properties of ferrioxalate.The molecular weight of sperm whale myoglobin is 17.8 kDa.17.8 kDa. The myoglobin content of sperm whale muscle is about 80 g · kg−1.80 g · kg−1. In contrast, the myoglobin content of some human muscles is about 8 g · kg−1.8 g · kg−1. Compare the amounts of O2O2 bound to myoglobin in human muscle and in sperm whale muscle. Assume that the myoglobin is saturated with O2,O2, and that the molecular weights of human and sperm whale myoglobin are the same. How much O2O2 is bound to myoglobin in human muscle? How much O2O2 is bound to myoglobin in whale muscle? The amount of oxygen dissolved in tissue water at 37°C37°C is about 3.5×10−5 M.3.5×10−5 M. What is the ratio of myoglobin‑bound oxygen to dissolved oxygen in the tissue water of sperm whale muscle?
- Barium fluoride has increased solubility in acidic solution. Why?Consider the insoluble compound cobalt(II) hydroxide , Co(OH)2 . The cobalt(II) ion also forms a complex with ammonia . Write a balanced net ionic equation to show why the solubility of Co(OH)2 (s) increases in the presence of ammonia and calculate the equilibrium constant for this reaction.For Co(NH3)62+ , Kf = 7.7×104 . Be sure to specify states such as (aq) or (s). + + K =A scientist was tasked to extract Fe from an aqueous suspension that contains 106 g of Fe2O3. The following steps detail the transformation of Fe2O3 (aq) to elemental iron: I. Enough sulfur trioxide gas was bubbled to Fe2O3 aqueous suspension to completely yield ferric sulfate. II. Then, 5.00 M nitric acid was added to ferric sulfate yielding an aqueous solution of ferric nitrate. III. Excess magnesium powder was added to the aqueous solution of ferric nitrate precipitating the solid iron ----- a. Write the balanced chemical reaction and the type of chemical reaction for [I], [II], [III]. Do not forget to indicate the states of the reactants and products (s, l, g).(CHOICES: COMBINATION, SINGLE DISPLACEMENT, DOUBLE DISPLACEMENT) b. What is the final mass of iron? Express final answers in 3 significant figures. c. High-concentration HCl is supposed to be added at the last part of the procedure. Briefly state its purpose.
- A saturated solution of Mg3(PO4)2 has a concentration of 0.939 mg per liter. Calculate the solubility product constant for Mg3(PO4)2.What is the net ionic equation of the reaction of FeCl2 with NaOH? what is the net ionic equation of the reaction of MgSO4 with Ba(NaO3)2?One of the steps for refining silver involves converting silver into dicyanoargenate(I) ions: 4Ag(s) + 8CN−(aq) + O2(g) + 2H2O(l) ⟶ 4[Ag(CN)2]−(aq) + 4OH−(aq)Explain why oxygen must be present to carry out the reaction. Why does the reaction not occur as: 4Ag(s) + 8CN−(aq) ⟶ 4[Ag(CN)2−(aq)?
- Because of the toxicity of mercury compounds, mercury(I)chloride is used in antibacterial salves. The mercury(I) ion(Hg₂²⁺) consists of two bound Hg⁺ ions.(a) What is the empirical formula of mercury(I) chloride?(b) Calculate [Hg₂²⁺] in a saturated solution of mercury(I) chlo-ride (Ksp=1.5X10⁻¹⁸).(c) A seawater sample contains 0.20 lb of NaCl per gallon. Find[Hg₂²⁺] if the seawater is saturated with mercury(I) chloride.(d) How many grams of mercury(I) chloride are needed to satu-rate 4900 km³ of pure water (the volume of Lake Michigan)?(e) How many grams of mercury(I) chloride are needed to satu-rate 4900 km³ of seawater?What volume of 0.200 M NaOH is necessary to neutralize the solution produced by dissolving 2.00 g of PCl3 is an excess of water? Note that when H3PO3 is titrated under these conditions, only one proton of the acid molecule reacts.Calculate the equilibrium concentration of Zn2+(aq) in a solution that is initially 0.150 M Zn(NO3)2 and 0.800 M NH3. The formation constant for [Zn(NH3)4]2+(aq) is Kf = 2.8 × 109.