Pls help with these Chemistry questions: Show solutions please. Thank you. 1. In
ID: 951334 • Letter: P
Question
Pls help with these Chemistry questions: Show solutions please. Thank you.
1. In creating a balanced equations for the reactions between each acid and base:
a) Lithium hydroxide and chlorous acid
b) Phosphoric acid and strontium hydroxide
What salt is created in each instance?
If each acid solution has a concentration of 10 M in a volume of 230 mL, and a stock solution of 5 M base, what volume is needed of the base to titrate with the acid?
2. Create a balanced chemical equations for the reactions of the 2 compounds: Indicate the oxidation numbers for EACH atom participating in the reactions. Write the half reactions for each redox reaction.
a) Iron and oxygen to form iron (III) oxide
b) The displacement of Zinc in zinc (II) chloride by silver.
c) Ammonia and calcium chlorate react to yield nitogen gas, water, and aqueous calcium chloride.
3. Molar concentrations:
a) Find the concentration of 89.0 g of hydrobromic acid dissolved in 2300.0 mL of water.
b) Find the concentration of 25.0 mg of solver chlorate dissolved in 100.00 mL of water.
c) How many moles are present in 100.00 mL of a 2.00x10^-1 M of magnesium acetate solution? What is the mass of the compound in solution?
4. a) What is teh final volume if 10.0 mL of solution with initial concentration of 0.455 M is diluted to a final concentration of 0.00550 M?
b) What concentration of Potassium hydroxide of 15.0 mL initial volume is needed to neutralize 10.0 mL of hydrochloric acid with a concentration of 0.92 M?
5. What is the net ionic equation of the reaction when sodium phosphate is mixed with calcium chloride? (show how to balance the reaction)
6. Write the reactants and the products of the reaction:
a) between potassium hydroxide and hydroiodic acid (balance the reaction). What type of reaction is this?
b) between zinc and oxygen (balance the reaction). Include the half-reactions. What type of reaction is this?
7. Calculate the molarity of a solution made by dissolving 89.0 g of HI in 1200.0 mL of water.
8. What is the molarity of a solution of 25.0 mg of silver nitrate in 250 mL of water?
9. How many moles of potassium are preent in 100 mL of a 0.200 M of K2CrO7 solution?
10. What is the mass of the compound dissolved in 100 mL in 0.200 M of K2CrO7 solution?
11. What is the volume of a solution in which 0.294 moles of CH3COOH are present and the molarity is 20.0 mM?
12. How many mL need to be added to a 0.30 M solution if the initial volume is 20.0 mL and the desired final concentration is 0.0040 M?
13. What is the concentration of 43.0 mL of calcium hydroxide needed to neutralize 86.0 mL of perchloric acid with a concentration of 0.92 M?
14. What is the final volume of a 10 mL solution that initially had a concentration of 0.455 M and is diluted to a final concentration of 0.0055 M?
15. The reaction of 85.0 mL of a silver nitrate solution and 75.0 mL of a 0.9 M calcium chloride solution yields a precipitate with a mass of 7.96 g. Assuming that the concentration goes to completion (all the silver is precipitated), find the initial concentration of silver nitrate.
16. What is the concentration of 15.0 mL of potassium hydroxide needed to neutralize 10.0 mL of hydrochloric acid with a concentration of 0.8 M?
THANK YOU VERY MUCH..... PLEASE SHOW FORMULAS / SOLUTIONS
Explanation / Answer
1. LiOH + HClO2 -----> LiClo2 + H2O
1 mole 1 mole
M1V1/n1 = M2V2/n2
10*230/1 = 5*v2/1
V2 = 460ml
2.2H3PO4 + 3Sr(OH)2 -----> Sr3(PO4)2 + 6H2O
M1V1/n1 = M2V2/n2
10*230/2 = 5*v2/3
V2 = 690ml
2.4 Fe + 3O2 ----->2 Fe2O3
ZnCl2 + Ag ----> 2AgCl + Zn
2NH3 + CaCo3------> N2 + CaCl2 + 3H2O
3. molarity = weight of solute*1000/gram molar mass *volume of solution in ml
= 89*1000/81*2300 = 0.477M
molarity = weight of solute*1000/gram molar mass *volume of solution in ml
= 0.025*1000/191*100 = 0.0013 M
c no of moles = molarity * volume in L
= 0.2*0.1 = 0.02 Moles
4. M1V1 = m2V2
0.455*10 = 0.0055*v2
V2 = 827.27 ml
KOH + HCl -----> KCl + H2O
M1V1/n1 = M2V2/n2
0.92*10/1 = M2*15/1
M2 = 9.2/15 = 0.613 M
5. 2Na3PO4(aq) + 3CaCl2 (aq)------> Ca3(PO4)2(s) + 6NaCl(aq)
3Ca+2 + 2PO43- -----> Ca3(PO4)2(s)
6.KOH + HI -----> KI + H2O
b.2 Zn + O2 ----->2 ZnO
7. molarity = weight of solute*1000/gram molar mass *volume of solution in ml
= 89*1000/128*1200
, = 0.579M