thepage="Osmotic(54)"
//12/2/02-updated netscape 7
refnumber=73
//global variables
alldata=0
attempts=0
which=0
theanswer=0
corrt=0
totl=0
option=0
theanswer=""
tests=0
alldata=new Array()
function solute(formula,gfw,parts,gs){
	this.formula=formula
	this.gfw=gfw
	this.parts=parts
	this.gs=gs
}
//This creates an array of solutes with 20 elements
cmpd=new Array();
//The following are the elements in the item array which have the properties
//shown in solute
cmpd[0]=new solute("CsCl",168.4,2,25);
cmpd[1]=new solute("NaCl",58.45,2,25)
cmpd[2]=new solute("NaNO3",85,2,25)
cmpd[3]=new solute("KI",166,2,25)
cmpd[4]=new solute("KOH",56,2,25)
cmpd[5]=new solute("Ca(NO3)2",164,3,25)
cmpd[6]=new solute("CH3OH",32,1,25)
cmpd[7]=new solute("HCl",36.5,2,25)
cmpd[8]=new solute("ethanol",46,1,25)
cmpd[9]=new solute("LiBr",86.8,2,25)
cmpd[10]=new solute("Fe(NO3)3",242,4,25)
cmpd[11]=new solute("Mg(NO3)2",148,3,25)
cmpd[12]=new solute("HNO3",63,2,25)
cmpd[13]=new solute("CaI2",294,3,25)
cmpd[14]=new solute("Co(NO3)2",183,3,25)
cmpd[15]=new solute("Na2SO4",142.08,3,27.8)
cmpd[16]=new solute("NaOH",40.01,2,25)
cmpd[17]=new solute("KNO2",85.1,2,25)
cmpd[18]=new solute("HI",128,2,25)
ansphrase=new Array("First, calculate the 'effective' moles of solute by calculating actual moles and then multiplying by the number of 'particles' per mole (here we use the symbol 'DF'-dissolving factor for that term).<br>","<br>Then, using the solution volume in liters, calculate the molarity.<br>","<br>The osmotic pressure can then be calculated<br>")
symbols=new Array("P(atm)","T(K)","V(L)","mass(solute)","gfw(solute)","DF","moles(solute)","<u>M</u>")
solved=0
equations=new Array()
equations[0]=symbols[6]+"="+symbols[5]+"*"+symbols[3]+"/"+symbols[4]//effmolessolute=DF*mass/gfw
equations[1]=symbols[7]+"="+symbols[6]+"/"+symbols[2]//M=n/V
equations[2]=symbols[0]+"="+symbols[7]+"*0.082*"+symbols[1]//P=M*R*T
//This is the function started when "New Problem" is pushed	
//This function first clears all old values using zeroout()
//The four variables(a,b,t) are then determined, using Math.random()
//They are then passed to the calculate function
function clear(){
	for(j=0;j<5;j++)document.forms[0].elements[j].value=""
	attempts=0
	tried=0
	clearansspot()
	document.forms[0].results.value=""
}
function startit(){
	clear()
	totl++
	document.forms[0].total.value=totl
	which=Math.floor(cmpd.length*Math.random())
	alldata[4]=cmpd[which].gfw
	alldata[3]=0
	while(alldata[3]<2 || alldata[3]>cmpd[which]["gs"])alldata[3]=25*Math.random();
	alldata[1]=alldata[8]=0
	while(alldata[1]<290 || alldata[1]>320)alldata[1]=400*Math.random();
	while(alldata[8]<200)alldata[8]=700*Math.random();
      calculate()
}
function calculate(){
	alldata[5]=cmpd[which].parts
	alldata[6]=alldata[5]*alldata[3]/alldata[4]
	alldata[2]=alldata[8]/1000
	alldata[7]=alldata[6]/alldata[2]
	alldata[0]=alldata[7]*.082*alldata[1]
	for( var j=0;j<alldata.length;j++){
		if(j!=5)alldata[j]=number(alldata[j],4,3);
	}
	alldata[5]=Math.round(alldata[5])
	compd=cmpd[which].formula
	buildquest()
}
//This function creates the problem and the answer method by first filling up 
//two tables and then partially clearing the "problem" table
//table
function buildquest(){
	document.forms[0].cpd.value=compd
	document.forms[0].themass.value=alldata[3]
	document.forms[0].thevol.value=alldata[8]
	document.forms[0].thet.value=alldata[1]
	buildanswer()	
}
// This is the "Check Answer Function
function answer(form){
	attempts++
	if(tried==1)alert("You've done this one! Get a new problem.");
	else{
	if(tried==2){totl++;document.forms[0].total.value=totl}
	if(form.thep.value>.95*alldata[0] & form.thep.value<1.05*alldata[0]){
		document.forms[0].results.value="correct"
		corrt++
		document.forms[0].correct.value=corrt
		tried=1
		}
	else{
		document.forms[0].results.value="incorrect"
		tried=2
		}
	}
}
function buildanswer(){
	getsolved()
	theanswer=""
	for(j=0;j<ansphrase.length;j++)theanswer+=ansphrase[j]+equations[j]+"=>"+solved[j];
}
function getsolved(){
	solved=new Array()
	solved[0]=alldata[5]+"*"+alldata[3]+"/"+alldata[4]+"=<b>"+alldata[6]+"moles</b>"//effmolessolute=DF*mass/gfw
	solved[1]=alldata[6]+"/"+alldata[2]+"=<b>"+alldata[7]+"M</b>"//M=n/V
	solved[2]=alldata[7]+"*0.082*"+alldata[1]+"=<b>"+alldata[0]+"atm</b>"//P=M*R*T
}