Question 15 Choose the correct compound #1 and #2 to give the product for the following reaction: NE 1) NaNO₂, HCl(aq), 0-5°C -OR 82 Select one A#1 #1 #1 Time left 0:49:46 D #1 NO₂ NH₂ 82 HQ H₂N- HỌ #2 HO #2 HO -OH -OH -OH
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- Hello, I was hoping for some help with the prelaboratory questions for Analytical Chemistry. I am pretty sure I got number one, but I was very confused about the "second endpoint" calculations and I am pretty sure I have calculated the percentage wrong. These are the equations we are given to work with and the questions are below. Thanks in advance! Eq. 2 CO32- + H+ Û HCO3- (bicarbonate ion) Eq. 3 HCO3- + H+ Û H2CO3 (carbonic acid) Eq. 4 However: H2CO3 (aq) Û CO2 (g) + H2O How much concentrated HCl acid is required to make 0.500 L of a 0.100 M HCl solution? One can calculate the Molarity (M) of the HCl from the weight percentage on the reagent bottle (which is usually 37.0% (w/w) with a density of 1.19 g/mL). A weight of 1.300 g of sodium carbonate (MW = 105.989 g/mol) is dissolved in 250.0 mL water. If a 25.00 mL aliquot of the sodium carbonate solution is placed into an E-flask and titrated with 0.1034 M HCl, what should be the volume of HCl to reach the second…Hydrazine N2H4can interact with water in two stepsN2H4(aq) + H2O (l) ↔N2H5+(aq) + OH-(aq) Kb1= 8.5 x 10-7N2H5+(aq) + H2O (l)↔N2H62+(aq) + OH-(aq) Kb2= 8.9x 10-16a)What is the concentration of OH-; N2H5+; and N2H62+in a 0.010 M solution of hydrazine?b)What is the pH of the 0.010 M solution of hydrazine?(please see pictures attached for reference. I tried my best) 27. Dissolved dioxygen in water samples can be determined by the following equations:2MnSO4(aq) + 4NaOH(aq) + O2(g) --> 2MnO2(s) + 2Na2SO4(aq) + 2H2O(l)2MnO2(s) + 2H2SO4(aq) + 2NaI(aq) -->MnSO4(aq) + I2(aq) + Na2SO4(aq) + 2H2O(l)I2(aq) + 2Na2S2O3(aq) --> Na2S4O6(aq) + 2NaI(aq)A water sample from the local river was treated according to the first two equations above. Exactly 200.00 mL ofthis treated water required 8.32 mL of 0.0250 M Na2S2O3 to titrate to the endpoint. Calculate the concentration ofdissolved oxygen in the water sample.A) 1.04 x 10-3MB) 2.08 x 10-4MC) 5.20 x 10-4MD) 8.67 x 10-7ME) 4.33 x 10-7M 28) How many neutrons are needed to initiate the fission reaction shown? 23592 U + ? 10 n --> 13956 Ba +9436 Kr+ 310n a) 0 b) 1 c) 2 d) 3 e) 5 20. Consider the substances H2O, KI, H2S, CH4. Which answer has the substances arranged in order ofDECREASING boiling point?a) KI > H2O > CH4 > H2S b) KI…
- What reagent/s is/are needed to confirm the identity of the cation in the diagram? a. acetic acid b. Ba(NO3)2 c. 6M H2SO4 d. excess NaOH e. excess ammonia f. ammonium oxalate g. nitric acid h. Fe(NO3)3 i. K4Fe(CN)6 j. K3Fe(CN)6 k. ammonia l. MgCl2 m. potassium permanganate n. 18M H2SO4 o. KSCN p. NaOH q. ferrous sulfateWhy is H2SO4 a weaker acid than HClO4? I. S is less electronegative than Cl. II. H2SO4 has fewer terminal O atoms than HClO4. III. The S–H bond is less polar than the Cl–H bond. Select one: a.I only b.I and II only c.I, II, and III d.II onlyWhat fraction of iminodiacetic acid is in each of its four forms ( H3A H2A− , HA2− , A3− ) at pH 3.651 ? The p?a values for iminodiacetic acid are 1.85 ( p?a1 ), 2.84 ( p?a2 ) and 9.79 ( p?a3 ). ?H3A= ? α H2A = ? ?HA2−= ? αA3− = ?
- Complete the balanced dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Cs2CO3(s) = 2Cs+(aq) + 3CO(aq) Complete the balanced dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. CH3OH(aq) = Complete the balanced dissociation equation for the compound below in aqueous solution. If the compound does not dissociate, write NR after the reaction arrow. Mg(OH)2(s) =Select every equation that is expected to favor the products. Question options: SCN- + HSeCN HSCN + SeCN- PH2- + S-2 HS- + PH-2 HCF3 + CCl3- CF3- + HCCl3 H2XeO4 + XeO4-2 2 HXeO4-1 NO2- + HNO NO- + HNO2Ques 3&4 do any 1 thank you
- Given the table below, what is the most probable identity of the acid?Acid KaHypochlorous acid 3.0 x 10⁻⁸Nitrous acid 7.1 x 10⁻⁴Hydrogen cyanide 6.2 x 10⁻10Propionic acid 1.3 x 10⁻⁵Consider the following reaction: X-SH ⇌ X-S- + H+ The pKa for the sulfhydryl (thiol) group (SH) is 8.37. Choose any/all statements that apply: X-SH is a base. X-S- is the conjugate base of X-SH. H+ is a proton acceptor. X-S- is the conjugate acid of X-SH. At neutral pH, the equilibrium lies such that X-S- is the predominant species.Hello. Please help me with a, b, and c. Handwritten solutions are prefered for more clear understanding Liquid ammonia (anhydrous NH3(l)) is often used as a solvent. Like water, ammonia undergoes autoionization by the transfer of a proton: 2NH3 = NH4+ + NH2- K = 1×10-33 at -50°C Since ammonia is better proton acceptor than water, the ionization of acids is relatively enhanced in liquid ammonia. For example, acetic acid is a strong acid in liquid ammonia. 1a) Estimate [NH4+] (mol/L) in pure (i.e. neutral) liquid ammonia at -50°C. 1b) Calculate [NH4+] (mol/L) in a 5.33×10-1 M solution of acetic acid in liquid ammonia at -50°C. 1c)Estimate [NH2-] (mol/L) in a 5.33×10-1 M solution of acetic acid in liquid ammonia at -50°C.