24) When the following net-ionic equation is balanced in an acidic solution, what is 24) the sum of the coefficients? HNO2 + Cr2O7-2 Cr+3 + NO3- A) 18 B) 17 C) 19 D) 20
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- A 0.022 2 M solution of HA is 0.15% dissociated. Calculate pKa for this acid.A physician wishes to prepare a buffer solution at pH = 3.82 that efficiently resists changes in pH yet contains only small concentrations of the buffering agents. Determine which one of the following weak acids, together with its sodium salt, would probably be best to use: m-chlorobenzoic acid, Ka= 1.04 × 10-4 ; p-chlorocinnamic acid, Ka=3.89 × 10-5 ; 2,5-dihydroxybenzoic acid, Ka = 1.08 ×10-3 ; or acetoacetic acid, Ka= 2.62 × 10-4 . Explain.Your research advisor asks you to prepare a buffer solution at pH = 12.5 with capacity of about 0.100 M. Given the following solutions available (of any concentration), determine possible concentrations of the best conjugate species for this solution. Acetic acid: The pKa = 4.74; hypochlorous acid: pKa = 2.06; methylamine: pKb = 3.36.
- a solution of phenylhydrazine (C6H5-NH-NH2) with ionic strength 0.1 mol/L has pH = 8.13. Determines the pKa for the phenylhydrazinium ion (C6H5-NH-NH3+)How would you prepare 1.00 L of a buffer solution at pH 6.00 from 0.500 M Na3AsO4 and 0.400 M HCl? Chapter 15, Problem 15.25 QAP Skoog1. The substance to be analyzed – is green colored, highly soluble in water salt. Dimethylglyoxime reaction gives pinky-red precipitate. After precipitation of cation by “sodium carbonate drawing out” method, supernatant was treated by silver nitrate solution in acid medium – appearance of white precipitate, which soluble in saturated ammonium carbonate solution, has been observed. What kind of substance is this? Explain you answer, provide chemical equations .
- What is the concentration of free Hg2+ in 2.6061e-4 M Hg(NO3)2 and 1.1005 M NH3? Hg2+ + 4 NH3 → [Hg(NH3)4]2+ Kf = 1.800e+19A mixture of NaCl, SiO2, and CaCO3 is separated following the procedure given in this experiment. Indicate how each of the following procedural changes would affect the amount of the specified substance recovered. Briefly explain. Hint: Refer to Table 1 for Solubility & Reactivity The recovery of CaCO3 was attempted by adding 3M H2SO4 instead of 3M HCl to the SiO2/CaCO3 residue.Molecule A is C6H9O2F and an aqueous solution of 0.0130 M of molecule A has a pH of 1.0 . Calculate the pKa. Use at least 2 sig figs and no scientific notation.
- Alizarin yellow R, Ka=7.9×10−12, is yellow in its protonated form (HX) and red in its ionized form (X−). At what pH will alizarin yellow R be a perfect orange color?14. A 130.00 mL solution of 0.00335 M A3B4 is added to a 160.00 mL solution of 0.00105 M C3D4. What is pQsp for A3D4?How many moles of Fe(OH)2 [Ksp = 1.8 × 10–15] will dissolve in 1 L of water buffered at pH = 12.00? A) 1.8 × 10–11 mol B) 1.8 × 10–9 mol C) 5.0 × 10–12 mol D) 8.0 × 10–6 mol E) 4.0 × 10–8 mol