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- For the following reactions, predict whether the pressure of the reactants or products increases or remains the same when the volume of the reaction vessel is increased. (a) H2O(l)H2O(g) (b) N2(g)+3H2(g)2NH3(g) (c) C2H4(g)+H2O(g)C2H5OH(g)Some sulfuric acid is spilled on a lab bench. You can neutralizethe acid by sprinkling sodium bicarbonate on it and thenmopping up the resulting solution. The sodium bicarbonatereacts with sulfuric acid according to:2 NaHCO3(s) + H2SO4(aq)----->Na2SO4(aq) + 2 H2O(l)+ 2 CO2(g)Sodium bicarbonate is added until the fizzing due to the formationof CO2(g) stops. If 27 mL of 6.0 M H2SO4 was spilled,what is the minimum mass of NaHCO3 that must be addedto the spill to neutralize the acid?__K2S(aq) + __H3PO4(aq) ® __K3PO4(aq) + __H2S(g) In a reaction mixture of 14.2 mL of 0.42 M K2S and 6.0 mL of 0.85 M H3PO4: 1. The theoretical yield of H2S from this reaction mixture, in mL at STP is _______ mLSTP 2. If 120 mL at STP of H2S was isolated, the percent reaction yield is ______
- In the interface between sediment and water around a deep lake bottom, dissolved oxygen (DO) is usually low. Under such a condition, iron and sulfur typically exist in their reduction forms (i.e. Fe2+ and S2-). Fe2+ and S2- can readily react with each other to produce ferrous sulfide (FeS), which is a black solid substance and finally settles down into the sediments at the lake bottom. The solubility product constant (i.e. equilibrium constant) of FeS is 8 x 10-9. At a chemical equilibrium state, what is the concentration of S2- in the water nearby the sediments if Fe2+ concentration in water is 10 - 4 M.The KspKsp of a salt corresponds to a reaction with the following general format: salt(s)⇌mcation(aq)+nanion(aq)where mm and nn are the coefficients that balance the equation. Equilibrium constants follow the general format of products over reactants (excluding pure liquids and solids) with each species raised to the power of its coefficient in the balanced equation. KspKsp is no exception, so Ksp=[cation]m[anion]nKsp=[cation]m[anion]n Part A If 500.0 mLmL of 0.10 mol L−1 Ca2+mol L−1 Ca2+ is mixed with 500.0 mLmL of 0.10 mol L−1 SO42−mol L−1 SO42−, what mass of calcium sulfate will precipitate? KspKsp for CaSO4CaSO4 is 2.40× 10−52.40×10−5. Express your answer to three significant figures and include the appropriate unitsConsider two solutions, the first being 50.0 mL of1.00 M CuSO4 and the second 50.0 mL of 2.00 M KOH.When the two solutions are mixed in a constant-pressurecalorimeter, a precipitate forms and the temperature of themixture rises from 21.5 to 27.7 °C. (a) Before mixing, howmany grams of Cu are present in the solution of CuSO4?(b) Predict the identity of the precipitate in the reaction.(c) Write complete and net ionic equations for the reactionthat occurs when the two solutions are mixed. (d) From thecalorimetric data, calculate ΔH for the reaction that occurson mixing. Assume that the calorimeter absorbs only a negligiblequantity of heat, that the total volume of the solutionis 100.0 mL, and that the specific heat and density of thesolution after mixing are the same as those of pure water.
- When 22.0 mL of a 8.84×10-4 M potassium carbonate solution is combined with 25.0 mL of a 6.48×10-4 M iron(II) bromide solution does a precipitate form? fill in the blank 1 (yes or no) For these conditions the Reaction Quotient, Q, is equal to . ( Please type answer note write by hend )Ques-When 15.0mL of a 3.68×10^-4M potassium phosphate solution is combined with 25.0mL of a 8.54×10^-4 M barium Hydroxide solution does precipitated.......(yes/No). And for these conditions the reaction quotient,Q is equal to...... For more clarification see attached image(A) A student tries to dissolve 50g of KNO3 in 50 g of water at 20oC. What mass of precipitate will form? (B) 25 mL of a saturated solution of K2Cr2O7 was cooled from 90oC to 50oC, how many moles solid will precipitate from solution?
- At 25oC, the ΔH o andΔH o for the following reaction is -24.7 kJ/mol and -49.9 J/mol-K, respectively. H2S (aq) + CN- (aq) ⇋ HS- (aq) + HCN (aq) If you mix 100 mL of 0.0450 M NaCN with 100 mL of 0.0450 M H2S, the reaction will proceed as indicated in the equation and will reach an equilibrium in the end. What will be the molar concentration of HCN at equilibrium?The solubility of Ag(I) in aqueous solutions containing dif-ferent concentrations of Cl is based on the following equilibria:Ag⁺(aq)+Cl⁻(aq)⇌AgCl(s) Kₛₚ=1.8X10⁻¹⁰ Ag⁺(aq)+2Cl⁻(aq)⇌AgCl₂⁻(s) K(f)=1.8X10⁻⁵ When solid AgCl is shaken with a solution containing Cl⁻, Ag(I)is present as both Ag⁺ and AgCl₂⁻. The solubility of AgCl is thesum of the concentrations of Ag and AgCl₂.(a) Show that [Ag⁺] in solution is given by[Ag⁺]=1.8X10⁻¹⁰/[Cl⁻]and that [AgCl₂⁻] in solution is given by [AgCl₂⁻](3.2X10⁻⁵)([Cl⁻] (b) Find the [Cl⁻] at which [Ag⁺][AgCl₂⁻].(c) Explain the shape of a plot of AgCl solubility vs. [Cl⁻].(d) Find the solubility of AgCl at the [Cl⁻] of part (b), which is the minimum solubility of AgCl in the presence of ClCalcium carbonate (e.g. from limestone) is relatively insoluble in water, and the solubilitydecreases with rising temperature. This is why CaCO3 precipitates out as ‘scale’ in hot water more readily than cold water. At a temperature of 20oC, calcium carbonate pKs= 8.8; at 35oC, pKs= 9.25. If you had water that was at equilibrium with excess calcium carbonate at 20oC and then raised the temperature to 35oC, what is the mass of CaCO3 that will precipitate out per litre of water? Hint: the difference in solubility will drive the reaction back to solid. CaCO3(s)↔Ca2++CO2−
