CHEM 1101 Lecture Notes - Lecture 8: Solubility Equilibrium, Third Order, Lead

44 views4 pages

pearpig661

24 Apr 2018

School

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

When a reaction reaches completion, it is said to be at equilibrium. Keq, also known as kp, is used for pressure of gas, and concentration of aqueous material. Kc, is used for concentration of gases and of aqueous material. They (cid:271)oth ha(cid:448)e the fo(cid:396)(cid:373) of (cid:862)p(cid:396)odu(cid:272)t o(cid:448)e(cid:396) (cid:396)eage(cid:374)t(cid:863) For equation aa + bb cc + dd, (cid:1837)(cid:3032)(cid:3044)= [(cid:3004)](cid:3280)(cid:3278) [(cid:3005)](cid:3280)(cid:3279) When writing kc or keq in expression of product over reagent, consider only gases and aqueous material. Olids a(cid:374)d li(cid:395)uids a(cid:396)e (cid:272)o(cid:374)side(cid:396)ed to (cid:271)e (cid:862)1(cid:863) For example, for reaction na2so4 (s) + h2o(l) 2 na+ (aq) + so4. Keq tells you if the reaction will go to completion or not. Keq > 1000 reaction goes to completion. Relation between keq and kc (cid:1837)(cid:3032)(cid:3044) = k(cid:3004) (cid:4666)r t(cid:4667) (cid:3041) R: ideal gas constant = 0. 08206 (cid:3013). (cid:3028)(cid:3047)(cid:3040)(cid:3040)(cid:3042)(cid:3039). (cid:3012) : total #mole of gas in products total #mole of gas in reagents.

Related Questions

ENT ives To determine equilibrium concentrations for species in solution . Examine temperature effects on reaction equilibrium Investigate the shift in equilibrium from different stresses on a system kills . Use colorimeter to determine unknown solution concentrations ced .Preparing temperature baths to change reaction conditions tionEquilibrium is defined as a state in which the concentrations of both the reactants and products have no tendency to change with time. We can restate this by saying that the rate of the forward reaction is equal to the rate of the reverse reaction. Recall that with rate we are simply defining how fast a reaction is proceeding, a speed at which the reaction proceeds. Take note that when writing an equilibrium expression, pure liquids (denoted by l or 2) and pure solids (denoted by s) are omitted. Typically we express the equilibrium by K or Kp where c and p denote either concentration or partial pressure respectively. We refer to this value of K, or Kp as an equilibrium constant For any reaction, Kc can be written as the product of the concentration of products, raised to their stoichiometric coefficients, divided by the product of the concentration of the reactants raised to their stoichiometric coefficients. See Equation (5-1) below for an example: aA(aq) + bB(aq-cC(aq) + dD(aq) (5-1) A] [B]b As mentioned before, K, or K, are equilibrium constants meaning that they will have the same value unless temperature is changed. This brings in two important ideas 1) We can perturb the equilibrium concentrations of a reaction, say [A] for instance which will cause the other concentrations to shift so that K for the reaction remains constant. 2) If we change temperature, we will either increase or decrease our value of K depending on the specific reaction we are examining. Determining K, and Equilibrium Concentrations During lecture we often discuss the idea of using ICE tables as a method for organizing and calculating concentrations of reactions as they proceed towards equilibrium. In a typical ICE table you need to know initial concentrations and the magnitude of K to determine the equilibrium concentrations. Alternatively, if you know the equilibrium concentrations for a reaction you can calculate K. For this experiment we will be examining a complex ion formation, when iron(III) ion

please help with both questions!!! Thank you so much!!!

Show transcribed image text

Â± Calculating Equilibrium Constants
The equilibrium constant, K, of a reaction at a particular temperature is determined by the concentrations or pressures of the reactants and products at equilibrium.

For a gaseous reaction with the general form

aA+bBâcC+dD

the Kc and Kp expressions are given by

Kc=[C]c[D]d[A]a[B]b

Kp=(PC)c(PD)d(PA)a(PB)b

The subscript c or p indicates whether K is expressed in terms of concentrations or pressures. Equilibrium-constant expressions do not include a term for any pure solids or liquids that may be involved since their composition does not change throughout the reaction. The standard state of a pure substance is the pure substance itself, and although the quantity may change the sample remain pure. The concentration is effectively equal to 1, and will not impact the magnitude of K.
Part A
Phosgene (carbonyl chloride), COCl2, is an extremely toxic gas that is used in manufacturing certain dyes and plastics. Phosgene can be produced by reacting carbon monoxide and chlorine gas at high temperatures:

CO(g)+Cl2(g)âCOCl2(g)

Carbon monoxide and chlorine gas are allowed to react in a sealed vessel at 456 âC . At equilibrium, the concentrations were measured and the following results obtained:

Gas Partial Pressure
(atm)
CO 0.900
Cl2 1.18
COCl2 0.250

What is the equilibrium constant, Kp, of this reaction?
Express your answer numerically.

Kp =
0.235

SubmitHintsMy AnswersGive UpReview Part
Correct
Deriving concentrations from data
In Part A, you were given the equilibrium pressures, which could be plugged directly into the formula for K. In Part B however, you will be given initial concentrations and only one equilibrium concentration. You must use this data to find all three equilibrium concentrations before you can apply the formula for K.
Part B
The following reaction was performed in a sealed vessel at 774 âC :

H2(g)+I2(g)â2HI(g)

Initially, only H2 and I2 were present at concentrations of [H2]=3.10M and[I2]=2.10M. The equilibrium concentration of I2 is 0.0600 M . What is the equilibrium constant, Kc, for the reaction at this temperature?
Express your answer numerically.

Kc =

CHEM 1101 Lecture Notes - Lecture 8: Solubility Equilibrium, Third Order, Lead

Document Summary

Get access

Related textbook solutions

Chemistry: Structure and Properties

Basic Chemistry

Principles of Chemistry Molecular Approach

Chemistry: Structure and Properties

Principles of Chemistry Molecular Approach

Chemistry: A Molecular Approach

Chemistry: A Molecular Approach

Principles of Chemistry: A Molecular Approach

Chemistry: The Central Science

Related Documents

CHEM 1101 Study Guide - Quiz Guide: Molecular Mass, Colloid, Chemical Equation

CHEM 1301 Chapter Notes - Chapter 14.1-14.6, 16.4 : Dynamic Equilibrium, Equilibrium Constant, Elementary Reaction

CHE 2B Study Guide - Final Guide: Solubility Equilibrium, Chemical Equilibrium, Equilibrium Constant

Related Questions