How are `0.50 m Na_(2)CO_(3) and 0.50 M Na_(2)CO_(3) `different ?

How are 0.50mol Na_(2)CO_(3) and 0.50M Na_(2)CO_(3) different?

5 g sample contain only Na_(2)CO_(3) and Na_(2)SO_(4) . This sample is dissolved and the volume made up to 250 mL. 25 mL of this solution neutralizes 20 mL of 0.1 M H_(2)SO_(4) . Calcalute the % of Na_(2)SO_(4) in the sample .

A solution is 0.10 M Ba(NO_(3))_(2) and 0.10 M Sr(NO_(3))_(2.) If solid Na_(2)CrO_(4) is added to the solution, what is [Ba^(2+)] when SrCrO_(4) begins to precipitate? [K_(sp)(BaCrO_(4))=1.2xx10^(-10),K_(sp)(SrCrO_(4))=3.5xx10^(-5)]

What is the molar solubility of Ag_(2)CO_(3)(K_(sp)=4xx10^(-13)) in 0.1M Na_(2)CO_(3) solution ?

50 mL of 0.05 M Na_(2)CO_(3) is titrated against 0.1 M HCl. On adding 40 mL of HCl, pH of the solution will be [Given : For H_(2)CO_(3),pK_(a1)=6.35,pK_(a2)=10.33,log 3=0.477,log 2=0.30]

Common name of Na_2 CO_3 . 10H_2O

Calculate approximate pH of the resultant solution formed by titration of 25 mL of 0.04 M Na_(2)CO_(3) with 50 mL of 0.025 M HCl. [Given : pK_(a1)=6.4 and pK_(a2)=10.3 for H_(2)CO_(3)]

A mixture NaOH+Na_(2)CO_(3) required 25mL of 0.1 M HCl using using phenolpththalein indicator. However the same amount of the mixture required 30mL of 0.1M HCl when methyl orange was used as the indicator. The molar ration of NaOH and Na_(2)CO_(3) in the mixture was:

For the reaction, 2Fe(NO_3)+3Na_2COrarrFe_2(CO_3)_3+6NaNO_3 initially 2.5 mole of Fe(NO_3)_3 and 3.6 mole of Na_2 CO_3 are taken. If 6.3 mole of NaNO_3 is obtained then % yield of given reaction is :