I need help with question 4-6. 4(2points) What is the molarity of a solution tha

Question

I need help with question 4-6.

4(2points) What is the molarity of a solution that is 11ml to which 11g of Baso, is added. 5 (5 points) There is H3PO, available in stock solution that has an assay of 87% and a density (specific gravity) of 1.24. What is the molarity of this solution? Using this solution how would 1 Lof 2N solution be made. 6 (5 points) HBO, is needed to neutralize 40 ML of a 4N solution of NaOH. How much of the acid should I put in 40 ML of the water to exactly neutralize this solution?

Explanation / Answer

4)

Molar mass of BaSO4,

MM = 1*MM(Ba) + 1*MM(S) + 4*MM(O)

= 1*137.3 + 1*32.07 + 4*16.0

= 233.37 g/mol

mass(BaSO4)= 11 g

number of mol of BaSO4,

n = mass of BaSO4/molar mass of BaSO4

=(11.0 g)/(233.37 g/mol)

= 4.714*10^-2 mol

volume , V = 11 mL

= 1.1*10^-2 L

Molarity,

M = number of mol / volume in L

= 4.714*10^-2/1.1*10^-2

= 4.3 M

Answer: 4.3 M

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