The borax that is Na2B4O5(OH)4•8H2O dissolves and dissociates in water: Na2B4O5(OH)4•8H2O(s)<-> 2Na+(aq) + B4O5(OH)42-(aq) + 8H2O(l)
Which of following concentrations are equal to the solubility of borax, s? (may be multiple answers)
a) s = 2 x [B4O5(OH)42-]
b) s = [B4O5(OH)42-]
c) s = 2 x [Na+]
d) s = [Na+]
e) s = (1/2) [B4O5(OH)42-]
f) s = (1/2) [Na+]
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The borax that is Na2B4O5(OH)4•8H2O dissolves and dissociates in water: Na2B4O5(OH)4•8H2O(s)<-> 2Na+(aq) + B4O5(OH)42-(aq) + 8H2O(l) Which...
Borax, sodium tetraboratedecahydrate, is an important mineral found in dry lakebeds in California. It is used to make soap and glass and used as a preservative. You can use the values of Ksp (solubility-product constant) of borax at different temperatures to determine ΔH∘, ΔS∘, and ΔG∘ for the dissolution of borax: Na2B4O5(OH)4⋅8H2O(s)(borax)→2Na+(aq)+B4O5(OH)42−(aq)(tetraborate)+8H2O(l) The relationship ln(Ksp)=−ΔH∘RT+ΔS∘R has the form of a linear equation, y=mx+b, where y is lnKsp and x is 1/T. The slope (m) is equal to −ΔH∘/R, and the...
The process of a compound dissolving, as in Reaction 1: Na2B4O5(OH)4 ∙ 8H2O (?) ⇌ 2Na+(??) + B4O5 (OH)4 2−(??) + 8H2O (?) , is called salvation. The enthalpy of salvation can either be positive or negative. a. If such a reaction is endothermic, what will the sign be of the enthalpy of salvation? b. Assuming that the above is true, how do you expect the value of K to change when comparing a high and a low temperature? c....
5) The molecular complex Cu(OH):- dissociates in water by the process Cu(OH)2(aq) = Cut(aq) + 4 OH Kc - 7.7 x 10-17 The initial concentration of Cu(OH)2- in an aqueous solution is 0.0140 M. No Cu?or OH ions are initially present. What is the concentration of Cution present when equilibrium is achieved? [12 points)
Sodium reacts with water according to the reaction: 2Na(s)+2H2O(l)→2NaOH(aq)+H2(g) Identify the oxidizing agent. a) H2O(l) b) NaOH(aq) c) Na(s) d) H2 (g)
The reaction of sodium(s) with water(l) to form sodium hydroxide(aq) and hydrogen(g) proceeds as follows: 2Na(s) + 2H2O(1)—>2NaOH(aq) + H2(g) When 5.91 g Na(s) reacts with sufficient H2O(1), 47.4 kJ is evolved. Calculate the value of A,H for the chemical equation given. kJ/mol Submit Show Approach Show Tutor Steps
The salt potassium hydroxide dissolves in water
according to the reaction:
KOH(s) K+(aq)
+ OH-(aq)
(a) Calculate the standard enthalpy change ΔH° for this reaction,
using the following data:
KOH(s) = -424.8 kJ
mol-1
K+(aq)
= -252.4 kJ mol-1
OH-(aq)
= -230.0 kJ mol-1
kJ
(b) Calculate the temperature reached by the solution formed when
8.05 g of KOH is dissolved in
0.162 L of water at 21.8 °C.
Approximate the heat capacity of the solution by the heat capacity...
16. Question 4 (6 Points): If only 0.160 g of Calcium hydroxide, Ca(OH), dissolves in 0.100 L of water, what is the solubility product constant (K.) value for calcium hydroxide at given temperature? Remember that a solid calcium hydroxide (strong base) will reach equilibrium with its solubility products (Ca + 2 OH in water according to Ca(OH)2(:) - Ca (aq) + 2 OH(aq)
help
2. (4) Given: PbSO4(e)Pb2 (aq) + SO42 (aq) Calculate the equilibrium constant, if AGt for PbSO4(s) is-811 Kj/mole; for Pb2+ (aq) is 24.3 Kj/mole and for SO42 (ag) is -742 Kj/mole. Calculate the solubility of PbSO4, if the pH of the solution is 4.32 and the [NaHSO4] is 0.10 M. Ka for HSO4 1.02 x 10-2 1. (6) From this week's experiment, what would you expect the signs on ΔΗΡ and So for the observed reaction, Na2B O(OH)8 H2o...
(a) (4 marks) The solubility product, Ksp, for Sn (OH) 4 (s) is 1.0 x 10-57. What is its solubility (in g / L) in pure water? (b) (4 marks) For the reaction 2 A (aq) ⇋ B (aq) + C (aq), the value of ΔGo is 3.71 kJ at 25.0oC. If the initial concentrations A (aq), B (aq), and C (aq) are respectively 0.423 M, 0.309 M, and 0.243 M, what will be the concentration of A (aq) when...
QUESTION 4 Use the reaction: I2(s) - I2(aq) to calculate the molar solubility of I2(s) in water. 12(aq) + 2 e-2 l'E"-+ 0.615 V 12(s)+2e-2IE 0.5355 V A. -1.1505 B. +1.1505 C.-0.0795 D. +0.0795 E. 1.33 x 10-39 F 2.05 X 10-3 G. 1.15 X 10 H. 7.84 X 1038 I. 0.5203 Eo for the solubiliy reaction: 12(s) 12(aq) K for the solubility reaction: I2s)I2(aq) $ Molar solubility of 12(s) in water - Solubility (in g/L) of I2(s) in water...