Hello, Is there Anyone for Helps? Why is hydroxide ion a strong base in water solutions? A.

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Why is hydroxide ion a strong base in water solutions? A. OH is the only base. B. OH is the conjugate base of hydronium ion, H3O*. C. Strong bases dissolve completely in water and produce OH-ions D. All acids react completely with OH ions E. All bases react with water to produce OH ions. Which is true about a 0.25 M KOH solution? A. [KOH] = 0.25 M D. [H] = [OH] = 1.0x10-¹4 M The ionization reaction for water is: 170(1) about this reaction? B. [K]= [OH] = 0.25 M E. none of these A. between 3.5 and 4.5 D. between 9.0 and 9.5 A. If water is added the [H3O*] and [OH] increase. C. If base is added the [H3O*] and [OH] increase. E. Kw = [H₂O*][OH]/[H₂O]² The K₂ of hydrocyanic acid, HCN, is 5.0x10-10. The pH of 0.05 M HCN(aq) is: C. between 5.0 and 5.5 C. pH=0.60 H₂O (aq) + OH(aq), Which is true statement B. between 4.5 and 5.5 E. between 10.0 and 11.0 Benzoic acid, C6H5COOH, is 1.0% ionized in a 0.010 M solution. A.1.0x10³ B. If acid is added the [H3O*] and [OH] decrease. D. In pure water [H₂O*] equals [OH]. C6H5COOH(aq) → H(aq) + CH,COO (aq), What is the value of K₂? B. 1.0x104 C. 1.0x105 D. 1.0x106 E. 1.0x 102 Which set of solutes will form a buffer when dissolved in water to make 1 liter of solution? A. 0.2 mole of NaOH with 0.2 mole of HCL. C. 0.4 mole of CHCOOH with 0.4 mole of NaOH. 3. 0.3 mole of KOH with 0.2 mole of HBr. Which is the correct expression for the solubility product constant for Ag-CrO₂? A. K, -[Ag1[Cro.] D. Kap-[2Ag ] [Cro] B. Kup-[Ag][Cro E. Kap-[Ag ][Cro] C.HS B. 0.2 mole of NaCl and 0.2 mole of HNO3. D. 0.4 mole of NH; with 0.2 mole of NH.CL What is the conjugate base of H₂S. A. HS B. S² D. HS* The term K, for the ammonium ion, NH. , refers to which equation? A. NH (aq) + H_O(I) ≥ NH,(aq) +H;O (aq) B. NH(sq)+OH(m) → NH(aq) +HOI) C. NH, (sq) + HyO!) NH() +OH (ng) D. NHỉ (34) + HO° (aq) Đ NH(q) +HO* (aq) F. none of these Select the weaker acid from each of the following pairs: L. HBr or H₂Se II. HCIO, or H₂SO, A. LHBr C. L. H₂Se E. I. HBr II. HCIO, III. H₂SO II. HCIO, III. H₂SO, II. H₂SO, III H₂SO4 A. the concentration of Na will decrease. C. the concentration of F will decrease. D. all concentration will remain constant. C. Kap-[2Ag ][Cro.] B. L. HBr D. I. H₂Se III H₂SO, or H₂SO4 II. H₂SO, II. H₂SO, E. HS¹ .HNO, is classified as A. Weak acid B. Strong acid C. Strong base What is the pOH in a solution that has a pH of 3.27? A. 3.27 B. 5.37x10 C. 10.73 D. 3.73 E. 1.86x10 A beaker contains solution of CaF2 (K-4.0x10 ). There are some ions in the solution of NaF is added to the beaker. Which of the following will occur? D. Weak base III. H₂SO₂ III H₂SO, E. none of these B. the concentration of Ca² will decrease. D. the concentration of Ca² will increase. The correct mathematical expression for finding the molar solubility (S) of Sn(OH)₂ is: A. K₁-28² B. Kup-2 S¹ C. Kp-108 S³ D. K₁-45¹ E.K-8S¹ What is the [OH] in a solution that has a pOH of 2.70? A. 11.30 B. 2.0x10³ C. 5.0x10-¹2 D. 9.7 Which of the following describes a reaction that is always spontaneous? A. AH decrease, AS decrease B. AH increase, AS decrease C. AH increase, AS increase D. AH decrease, AS increase E. none of these The following reaction shows the condensation of water. H₂O(g) → H₂0 (1) Which of the following will be positive for the H₂O at 25 °C and 1 atm? A. AH B. AS C. AG D. two of these E. none of these For a certain process at 355 K, AG = -12.4kJ and AH = -9.2 kJ. Therefore, AS for the process is; A. 0 B. 9.0 J/K C.-9.0 J/K D.-21.6 J/K E. 21.6 J/k Consider the freezing of liquid water at -10 °C. For this process what are the sign for AH, AS, and AG? Α. ΔΗ = + Β. ΔΗ = - C. ΔΗ = D. ΔΗ = + E. AH AS-- AS + C₂H₂(g) C₂H6 (g) AS=+ AS=+ AS=- AG=0 AG=0 AG=- AG=+ AG= Given the following free energies of formations; AG (kJ/mol) 209.2 -32.9 calculate K, at 298 K for C₂H₂(g) + 2 H₂(g) →→ C₂H6 (g) A. 9.07x10¹¹ B. 97.2 C. 1.24x10³¹ E. 4.3 D. 2.72x10¹² E. None of these What is the pH of a solution that is 0.40 M HC₂H₂O₂ and 0.20 M NaC₂H₂O₂? (K, for acetic acid is 1.8x10 )? The K, for benzoic acid is 6.3x105. What is the pH in a 0.693 M solution of potassium benzoate, KCH,COO? At 699K, AG* = -23.25 kJ for the reaction H₂(g) +12(g) → 2HI (g). Calculate AG for this reaction if the reagents are both supplied, H₂(g) and I2(g), at 10.0 atm pressure and the product, HI(g), is at 1.00 atm pressure. Calculate the concentration of the silver ion, Ag, in a saturated solution of silver chloride, AgCl. (Kap=1.6x10.10) A 25.0 ml sample of 0.100 M CH₂COOH is titrated with 0.100 M NaOH. Calculate the pH of the solution at equivalent point and also where 20.00 ml of NaOH have been added. (K, for CH3 COOH = 1.8x10³) What is the pH of a solution that is 0.40 M HC₂H₂O₂ and 0.20 M NaC₂H₂O₂? (K, for acetic acid is 1.8x10 %)? The K, for benzoic acid is 6.3x105. What is the pH in a 0.693 M solution of potassium benzoate, KCH,COO? At 699K, AG* = -23.25 kJ for the reaction H₂(g) +12(g) → 2HI (g). Calculate AG for this reaction if the reagents are both supplied, H₂(g) and I2(g), at 10.0 atm pressure and the product, HI(g), is at 1.00 atm pressure. Calculate the concentration of the silver ion, Ag, in a saturated solution of silver chloride, AgCl. (Kap=1.6x10.10) A 25.0 ml sample of 0.100 M CH₂COOH is titrated with 0.100 M NaOH. Calculate the pH of the solution at equivalent point and also where 20.00 ml of NaOH have been added. (K, for CH3 COOH = 1.8x10³) Why is hydroxide ion a strong base in water solutions? A. OH is the only base. B. OH is the conjugate base of hydronium ion, H3O*. C. Strong bases dissolve completely in water and produce OH-ions D. All acids react completely with OH ions E. All bases react with water to produce OH ions. Which is true about a 0.25 M KOH solution? A. [KOH] = 0.25 M D. [H] = [OH] = 1.0x10-¹4 M The ionization reaction for water is: 170(1) about this reaction? B. [K]= [OH] = 0.25 M E. none of these A. between 3.5 and 4.5 D. between 9.0 and 9.5 A. If water is added the [H3O*] and [OH] increase. C. If base is added the [H3O*] and [OH] increase. E. Kw = [H₂O*][OH]/[H₂O]² The K₂ of hydrocyanic acid, HCN, is 5.0x10-10. The pH of 0.05 M HCN(aq) is: C. between 5.0 and 5.5 C. pH=0.60 H₂O (aq) + OH(aq), Which is true statement B. between 4.5 and 5.5 E. between 10.0 and 11.0 Benzoic acid, C6H5COOH, is 1.0% ionized in a 0.010 M solution. A.1.0x10³ B. If acid is added the [H3O*] and [OH] decrease. D. In pure water [H₂O*] equals [OH]. C6H5COOH(aq) → H(aq) + CH,COO (aq), What is the value of K₂? B. 1.0x104 C. 1.0x105 D. 1.0x106 E. 1.0x 102 Which set of solutes will form a buffer when dissolved in water to make 1 liter of solution? A. 0.2 mole of NaOH with 0.2 mole of HCL. C. 0.4 mole of CHCOOH with 0.4 mole of NaOH. 3. 0.3 mole of KOH with 0.2 mole of HBr. Which is the correct expression for the solubility product constant for Ag-CrO₂? A. K, -[Ag1[Cro.] D. Kap-[2Ag ] [Cro] B. Kup-[Ag][Cro E. Kap-[Ag ][Cro] C.HS B. 0.2 mole of NaCl and 0.2 mole of HNO3. D. 0.4 mole of NH; with 0.2 mole of NH.CL What is the conjugate base of H₂S. A. HS B. S² D. HS* The term K, for the ammonium ion, NH. , refers to which equation? A. NH (aq) + H_O(I) ≥ NH,(aq) +H;O (aq) B. NH(sq)+OH(m) → NH(aq) +HOI) C. NH, (sq) + HyO!) NH() +OH (ng) D. NHỉ (34) + HO° (aq) Đ NH(q) +HO* (aq) F. none of these Select the weaker acid from each of the following pairs: L. HBr or H₂Se II. HCIO, or H₂SO, A. LHBr C. L. H₂Se E. I. HBr II. HCIO, III. H₂SO II. HCIO, III. H₂SO, II. H₂SO, III H₂SO4 A. the concentration of Na will decrease. C. the concentration of F will decrease. D. all concentration will remain constant. C. Kap-[2Ag ][Cro.] B. L. HBr D. I. H₂Se III H₂SO, or H₂SO4 II. H₂SO, II. H₂SO, E. HS¹ .HNO, is classified as A. Weak acid B. Strong acid C. Strong base What is the pOH in a solution that has a pH of 3.27? A. 3.27 B. 5.37x10 C. 10.73 D. 3.73 E. 1.86x10 A beaker contains solution of CaF2 (K-4.0x10 ). There are some ions in the solution of NaF is added to the beaker. Which of the following will occur? D. Weak base III. H₂SO₂ III H₂SO, E. none of these B. the concentration of Ca² will decrease. D. the concentration of Ca² will increase. The correct mathematical expression for finding the molar solubility (S) of Sn(OH)₂ is: A. K₁-28² B. Kup-2 S¹ C. Kp-108 S³ D. K₁-45¹ E.K-8S¹ What is the [OH] in a solution that has a pOH of 2.70? A. 11.30 B. 2.0x10³ C. 5.0x10-¹2 D. 9.7 Which of the following describes a reaction that is always spontaneous? A. AH decrease, AS decrease B. AH increase, AS decrease C. AH increase, AS increase D. AH decrease, AS increase E. none of these The following reaction shows the condensation of water. H₂O(g) → H₂0 (1) Which of the following will be positive for the H₂O at 25 °C and 1 atm? A. AH B. AS C. AG D. two of these E. none of these For a certain process at 355 K, AG = -12.4kJ and AH = -9.2 kJ. Therefore, AS for the process is; A. 0 B. 9.0 J/K C.-9.0 J/K D.-21.6 J/K E. 21.6 J/k Consider the freezing of liquid water at -10 °C. For this process what are the sign for AH, AS, and AG? Α. ΔΗ = + Β. ΔΗ = - C. ΔΗ = D. ΔΗ = + E. AH AS-- AS + C₂H₂(g) C₂H6 (g) AS=+ AS=+ AS=- AG=0 AG=0 AG=- AG=+ AG= Given the following free energies of formations; AG (kJ/mol) 209.2 -32.9 calculate K, at 298 K for C₂H₂(g) + 2 H₂(g) →→ C₂H6 (g) A. 9.07x10¹¹ B. 97.2 C. 1.24x10³¹ E. 4.3 D. 2.72x10¹² E. None of these What is the pH of a solution that is 0.40 M HC₂H₂O₂ and 0.20 M NaC₂H₂O₂? (K, for acetic acid is 1.8x10 )? The K, for benzoic acid is 6.3x105. What is the pH in a 0.693 M solution of potassium benzoate, KCH,COO? At 699K, AG* = -23.25 kJ for the reaction H₂(g) +12(g) → 2HI (g). Calculate AG for this reaction if the reagents are both supplied, H₂(g) and I2(g), at 10.0 atm pressure and the product, HI(g), is at 1.00 atm pressure. Calculate the concentration of the silver ion, Ag, in a saturated solution of silver chloride, AgCl. (Kap=1.6x10.10) A 25.0 ml sample of 0.100 M CH₂COOH is titrated with 0.100 M NaOH. Calculate the pH of the solution at equivalent point and also where 20.00 ml of NaOH have been added. (K, for CH3 COOH = 1.8x10³) What is the pH of a solution that is 0.40 M HC₂H₂O₂ and 0.20 M NaC₂H₂O₂? (K, for acetic acid is 1.8x10 %)? The K, for benzoic acid is 6.3x105. What is the pH in a 0.693 M solution of potassium benzoate, KCH,COO? At 699K, AG* = -23.25 kJ for the reaction H₂(g) +12(g) → 2HI (g). Calculate AG for this reaction if the reagents are both supplied, H₂(g) and I2(g), at 10.0 atm pressure and the product, HI(g), is at 1.00 atm pressure. Calculate the concentration of the silver ion, Ag, in a saturated solution of silver chloride, AgCl. (Kap=1.6x10.10) A 25.0 ml sample of 0.100 M CH₂COOH is titrated with 0.100 M NaOH. Calculate the pH of the solution at equivalent point and also where 20.00 ml of NaOH have been added. (K, for CH3 COOH = 1.8x10³)

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1 The correct answer is C Strong bases by definition are bases that dissociate completely in water producing hydroxide ions 2 The correct answer is A ... View the full answer