3.4: Using concentrations of solutions in mol - TRIPLE

Answer 1

● Concentration​ ​of​ ​a​ ​solution​ ​can​ ​be​ ​measured​ ​in​ ​mol.​ ​per​ ​given​ ​volume​ ​of solution​ ​e.g.​ ​mol.​ ​per​ ​dm​33​ ​ ​(mol./dm3​ )​

● ​ ​Mass​ ​of​ ​a​ ​solute​ ​and​ ​the​ ​volume​ ​of​ ​a​ ​solution​ ​are​ ​related​ ​to​ ​the​ ​conc.​ ​of​ ​the solution​ ​through​ ​the​ ​equation​ ​moles​ ​=​ ​concentration​ ​x​ ​volume
o Use​ ​mass​ ​to​ ​find​ ​mol:​ ​mol.​ ​=​ ​mass​ ​/​ ​molar​ ​mass,​ ​then​ ​use​ ​conc.​ ​=​ ​mol.​ ​/ vol.​ ​as​ ​seen​ ​below

● If​ ​the​ ​volumes​ ​of​ ​two​ ​solutions​ ​that​ ​react completely​ ​are​ ​known​ ​and​ ​the concentration​ ​of​ ​one​ ​solution​ ​is​ ​known,​ ​the​ ​concentration​ ​of​ ​the​ ​other​ solution can​ ​be​ ​calculated:
o work​ ​out​ ​moles​ ​of​ ​solution​ ​where​ ​volume​ ​and​ ​concentration​ ​is​ ​known by​ ​moles​ ​=​ ​conc​ ​x​ ​vol​ ​(make​ ​sure​ ​volume​ ​is​ ​in​ ​dm​3,​ ​ ​to​ ​go​ ​from​ ​cm3​ ​​ ​to dm​3​​ ​÷​ ​1000)
o work​ ​out​ ​moles​ ​of​ ​other​ ​solution​ ​by​ ​mole​ ​ratio​ ​from​ ​equation
o now​ ​work​ ​out​ ​unknown​ ​concentration​ ​by​ ​using​ ​conc​ ​=​ ​mol​ ​/​ ​vol