When phosphoric acid (a trihydrogen acid) is neutralized with a base‚ the hydrogens are neutralised in 3 steps: STEP 1: H3P04 + NaOH > NaH2PO4 + H2O gives X amount of heat STEP 2: NaH2PO4 + NaOH > Na2HPO4 + H2O gives Y amount of heat STEP 3: Na2PO4 + NaOH > Na3PO4 +H2O gives Z amount of heat Therefore‚ the total heat of reaction ( Hrxn) is equal to: There are two (2) ways to calculate the heat of reaction using Hess’ Law: 1 Equation Method (Algebraic Method) 2 Heat of Formation Method (Summation Method)
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Ashley Silva Lab 7: Three Stooges in Chemical Reactions Objective: The purpose of this lab is to experimentally determine the equilibrium constant‚ Kc ‚ for the following chemical reaction: Fe3+ (aq) + SCN-(aq) ↔FeSCN2+(aq) Background Information: A system is at equilibrium when the rate of the forward reaction is the same as the rate of the reverse reaction. There is no change in concentration for the reactants or products at chemical equilibrium. When the system is disturbed there
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Chapter 6 practice MULTIPLE CHOICE 1. The formula for acetic acid‚ CH3CO2H‚ is an example of a(n) a.|condensed formula.| b.|mathematical formula.| c.|structural formula.| d.|molecular formula.| ANS: A OBJ: Goal #3.1: Interpret‚ predict‚ and write formulas for ionic and molecular compounds 3. Which of the following statements are correct? 1.|Metals generally lose electrons to become cations.| 2.|Nonmetals generally gain electrons to become anions.| 3.|Group 2A metals
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0M NH3 .Cu(OH)2(s) (( Cu2+(aq) + 2OH-(aq) Ksp Cu(OH)2 4(NH3(( NH4 + OH-) Kb NH3 x 4 Cu2+ + 4 NH3(( [Cu(NH3)4]2+ 1/Kf[Cu(NH3)4]2+ Net Keq = (Ksp Cu(OH)2 x (Kb NH3 x 4))/ Kf[Cu(NH3)4]2+ = 4.619 x 10-53 f. 1.0M Na3PO4 3(Cu(OH)2(s) (( Cu2+(aq) + 2OH-(aq)) Ksp Cu(OH)2 2(PO43- + H2O((HPO42- + H3O+) 1/Ka3 H3PO4 2(HPO43- + H2O((H2PO42- + H3O+) 1/Ka2 H3PO4 2(H2PO43- + H2O((H3PO42- + H3O+) 1/Ka1 H3PO4 3Cu2+ + 2PO43-(( Cu3(PO4)2 1/Ksp Cu3(PO4)2
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5mL of CuSO4 in another test tube. Using a pipette‚ transfer the solution of the first test tube into another clean one. Observe the first one and the fresh one. D. Double Replacement: Pour 2mL of zinc acetate in a clean test tube and add 2mL of Na3PO4. Observe what happens. Pour 5mL of Na2S in a clean test tube and add 1mL of HCl. Observe what happens.
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16. Pure nitrogen combines directly with an active metal to form a - Nitride 17. In a sample of solid Al(NO3)3‚ the ratio of aluminum ions to nitrate ions is - 1:3 18. In a sample of solid calcium phosphate Ca3(PO4)2‚ the ratio of calcium ions to phosphate ions is - 3:2 19. What is the total number of atoms in (NH4)2SO4? - 15 20. What is the total number of oxygen atoms present in one unit of Mg(ClO3)2? - 6 21. What is the total number of atoms of oxygen in the formula Al(ClO3)3.6H2O?
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ACID BASE TITRATION OBJECTIVES 1. To demonstrate the basic laboratory technique of titration 2. To learn to calculate molarity based on titrations INTRODUCTION Molarity (M) or molar concentration is a common unit for expressing the concentration of solutions. It is defined as the number of moles of solute per liter of solution (or millimoles of solute per milliliter of solution). The concentration of a basic solution can be determined by titrating it with a volume of a standard acid solution (of
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6. Discuss which of the following substances will increase‚ decrease or have no effect on the hardness of water: Ca (OH)2‚ Mg(HCO3)2‚ MgSO4‚ Ca(HCO3)2‚ CaSO4‚ CaCl2‚ KCl‚ NH4Cl‚ NH4OH‚ NH4)2CO3‚ Na2SO4‚ BaCO3‚ NaCl‚ NaOH‚ Na2CO3‚ Na3PO4‚ NaAlO2‚ Na2[Na4(PO3)6]. 7. 0.5 g CaCO3 was dissolved in dil HCl and diluted to 500 ml. 50 ml of this required 40 ml EDTA. 100 ml hard water required 50 ml EDTA and after boiling 50 ml consumed 20 ml EDTA. Calculate temporary hardness. 8
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balancing Instruction: Balance each chemical equation by adding a correct coefficient to it. Question 1 __ SnO2 + __ H2 → __ Sn + __ H2O Question 2 __ KOH + __ H3PO4 → __ K3PO4 + __ H2O Question 3 __ KNO3 + __ H2CO3 → __ K2CO3 + __ HNO3 Question 4 __ Na3PO4 + __ HCl → __ NaCl + __ H3PO4 Question 5 __ TiCl4 + __ H2O → __ TiO2 + __ HCl Question 6 __ C2H6O + __ O2 → __ CO2 + __ H2O Question 7 __ Fe + __ HC2H3O2 → __ Fe(C2H3O2)3 + __ H2 Question 8 __ NH3 + __ O2 → __ NO + __ H2O Question 9 __ B2Br6 + __
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Tara Keller Finding the Ratio of Moles of Reactants in a Chemical Reaction 9/6/13 Introduction The purposes of this lab are to measure the temperature change of the reaction between solutions of sodium hydroxide and phosphoric acid‚ calculate the enthalpy‚ H‚ of neutralization of phosphoric acid‚ and compare the calculated enthalpy neutralization with the accepted value. Theory Calorimetry is the measurement of change of heat in a reaction. A calorimeter is a tool to measure the amount of
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