Question

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Test No 73 M NasPO42 N 2.(8) a. How many moles of Na b. What is the molarity of Na'? NAME: POs are the 0250 L solution of 0.873 M 3. (7) What is the molarity of a NaOH solution th solution? (NaOH Molar Mass: 40.00 g/mol). In that contains 4.27 g of NaOH in 125.0 mL of 4. (8) Na2SO4 + a) Balance the above reaction. b) If 63.8 mol of Na2SO4 is used, how many moles of Al(OH Al(OH)3 Al2(SO4)3 + NaOH moles of Al(OH)3 is required to complete the reaction? 5.(6') A dilute solution is prepared by transferring 28.00 mL of a 0.2428 M stock solution to a 500.0 mL volumetric flask and diluting to mark. What is the molarity of this dilute solution?

Answer 1

Melasity Moles 2. a) Volume Moes 1Naz POy larity xJolume O 878 O-250 Moies Na PO4= 0.2195 mOlis 3- 3Na + ь) Naz POy + Contauns 3 moles Na Naz Poy 1 mol O.R195 molis Na3 POy Contains + Na 3 X 0.2195moles o 6585 mols NaT Moles Moles O.6585 Molauity ofNa O 250 Volume 2.634 M 91 Nat Given mas Moles Naon 3 0 Molau mss 4.279 -O.l0675 moe Melaudty Moles 106 75ml Volume (L) O.125L 1slaity NaoH= D.B54 M 4. Ala (SOu)3+ 6NaoH 3 Na2 soy + 2 ALOH)3- 3 moles Naz sO y eguies 2 mole Al(0H) b) 63-6mol Naz sOy, Fol ACLOH)3 gd 2 x63-842.53Mole MOles