Answer the following question 1) How many moles of LiF must be mixed with 0.1109 mole of HF and diluted to exactly 1 lit

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Answer the following question
1) How many moles of LiF must be mixed with 0.1109 mole ofHF and diluted to exactly 1 liter to prepare a solution having a pHof 3.701? K a(HF) = 3.5000e-4.
2)A laboratory manager wants to prepare 250.00 mL of a bufferwith a pH of 4.572 from equimolar solutions ofC 5H 4NCO 2H(K a = 1.500e-5) andLiC 5H 4NCO 2. Whatvolume of theLiC 5H 4NCO 2 solutionwould be required?
3)A buffer was made by mixing 0.1615 moles ofHN 3 with 0.1659 moles ofNaN 3 and diluting to exactly 1 liter. Whatwill be the pH after addition of 10.00 mL of 0.3895 M HBr to 50.00mL of the buffer? K a(HN 3) =1.900e-5. Note: only a portion of the original buffer is used inthe second part of the problem.
4)Calculate the pOH after addition of 15.32 mL of 0.1880 M KOHto 25.00 mL of 0.1947 MHC 7H 5O 2.K a(HC 7H 5O 2)= 6.500e-5
4b) Calculate the pH after addition of 18.60 mL of 0.1296 MHNO 3 to 25.00 mL of 0.1536 MCH 3CH 2NH 2.K b(CH 3CH 2NH 2)= 6.400e-4.
5) What is the solubility ofMg 3(PO 4) 2 ifit's K sp is 6.300e-26?