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Learning chemistry can be challenging. We are a community of educators and teachers helping students with their chemistry questions. 

Unanswered Questions

Calculating molarity and molality.

A sample of potassium aluminum sulfate 12-hydrate, KAl(SO4)2.12H2O, containing 118.6 mg is dissolved in 1.000 L of solution. Calculate the following for the solution:

a. The molarity of KAl(SO4)2.

b. The molarity of (SO4)2

Palladium crystal has 2 bond lengths, Alpha and Beta. How much energy does it take to go from alpha to beta?

A bond between two palladium can either be in the lowest engery state called alpha and a more excited state, called beta. How much energy does it take to go from alpha to beta? Or whats the difference in the bonds engery?

 

Enthalpy Question

2O3->3O2 deltaH=-285 kJ/molrxn 

Which reference electrode to select for electrochemical measurements? The one with Vycor or ceramic frit?
Is there any significant difference in quality and accuracy between reference electrode with Vycor frit (porous glass attached with heat-shrink tube) and the one 
 
equipped with ceramic frit (molten in the glass tube) like in this example https://redox.me/coll
Can someone please explain and show me how to di this question please....

Jacy bought a gold necklace weighing 21.3 grams from the flea market. She filled a graduated cylinder with water to the 5.0mL mark and dropped her necklace in. The level in the  graduated cylinder rose to 704mL. is her necklace real or fake?

Volumetric Analysis Help!!!

Many transition ometals occur naturally as sulfides. The follwing procedure was used to determine the sulfur conten of a particular metallic sulfide.

Identify the conjugate acid or base to the given weak acid or base

In the problem below identify each substance as a weak acid,strong acid,weak base,strong base both weak acid and weak base or neither acid or base

a) NH3

b) HCNO

C) HClO

d) Ba(OH)2

Answer :

a) NH3 : weak base

b) HCNO : weak acid

Identify the acid, base, conjugate acid and conjugate base in the given reactions

Identify the acid, base, conjugate acid and conjugate base for the following reactions:

a)   HClO4(aq) + H2O(l) ⇄H3O+(aq) + ClO4–(aq)


b)   H2SO3(aq) + H2O(l) ⇄H3O+(aq) + HSO3–(aq)

Lab Calculations help

Apologies for the stupid questions but I have confused myself.