The Ksp of PbBr2 is 6.60*10^-6 M^3. What is the molar solubility of PbBr2 in pure water?

What is the molar solubility of PbBr2 in 0.500 M KBr solution?

What is the molar solubility of PbBr2 in 0.500 M Pb(NO3)2 solution?

1. Calculate the pH during the titration of 25.00 mL of 0.1000 M LiOH(aq) with 0.1000 M HI(aq) after 24.2 mL of the acid have been added.

2. Calculate the pH during the titration of 30.00 mL of 0.1000 M CH₃CH₂COOH(aq) with 0.1000 M LiOH(aq) after 12 mL of the base have been added. K_a of propanoic acid = 1.3 x 10^-5.

Please help these questions!

For the following reactions please balance the equation and convert to a net ionic equation (see above) and give the correct physical state of each reactant and product in the net ionic equation ( s, l, g or aq), (net ionic equations may be reported in data and calculation section and need not be repeated here). (a) BaCl2 + Na3PO4 ---> Ba3(PO4)2 + NaCl (b) BaCl2 + Na2SO4 ---> BaSO4 + NaCl (c) BaCl2 + Na2CO3 ---> BaCO3 + NaCl (d) BaCl2 + Na2SO3 ---> BaSO3 + NaCl (e) BaSO3 + HNO3 ---> SO2 + H2O + Ba(NO3)2 (f) BaCO3 + HNO3 ---> CO2 + H2O + Ba(NO3)2 (g) Ba3(PO4)2 + HNO3 ---> H3PO4 + Ba(NO3)2 (h) AgNO3 + NaI ---> AgI + NaNO3 (i) AgNO3 + NaBr ---> AgBr + NaNO3 (j) AgNO3 + NaCl ---> AgCl + NaNO3 (k) NaI + Cl2 ---> I2 + NaCl (l) NaBr + Cl2 ---> Br2 + NaCl (m) 2NaNO3 + 2H2SO4 + 2FeSO4 ---> 2NO2 + Fe2(SO4)3 + 2H2O + Na2SO4 (n) 3NaNO2 + H2SO4 ---> 2NO + H2O + NaNO3 + Na2SO4 (o) 2NaNO2 + 2H2SO4 + 2FeSO4 ---> 2NO + Fe2(SO4)3 + 2H2O + Na2SO4 (p) H2SO4 + Na2CO3 ---> CO2 + Na2SO4 + H2O (q) H2SO4 + Na2SO3 ---> SO2 + Na2SO4 + H2O

Q1: If the theoretical yield of a reaction is 24.8 g and the actual yield is 18.5 g, what is percent yield?

Q2: When 11.5 gram of C are allowed to react with 114.5 g Cu2O, 87.4 g of Cu are obtained. Determine the limiting reactant, theoretical yield and percent yield.

Q3:This reaction of 185 g of Fe2O3 with 95.3 g of CO produces 87.4 g of Fe. Determine limiting reactant, theoretical yield, and percent yield.

1. Why is it important to know the difference between acids and bases, in terms of safety?

2. Ionic bonds, covalent bonds and hydrogen bonds all help to hold chemical entities together. Distinguish between these types of bonding and explain which type of bonding is responsible for matching the base pairs in DNA.

For each of the following unbalanced reactions, suppose 5.18 g of each reactant is taken. Determine which reactant is limiting, and also determine what mass of the excess reagent(s) will remain after the limiting reactant is consumed. Na2B4O7(s) + H2SO4(aq) + H2O(l) → H3BO3(s) + Na2SO4(aq)

Complete the following table by calculating the missing entries and indicating whether the solution is acidic, basic or neutral. the pOH for one row is 9.75 and the H+ on the bottom row is 6.17x10^-11.

For the row that the pOH is 9.75 you have to find the pH, the H+, OH- and if its an acid or base. For the row that the H+ is 6.17 x 10^-11 you have to find the ph, pOH, OH- and if its an acid or base

Find the pH during the titration of 20.00 mL of 0.2830 M benzoic acid, C₆H₅COOH (K_a = 6.3 ✕ 10^-5), with 0.2830 M NaOH solution after the following additions of titrant.

(a)    0 mL


(b)    10.00 mL


(c)    15.00 mL


(d)    19.00 mL


(e)    19.95 mL


(f)    20.00 mL


(g)    20.05 mL


(h)    25.00 mL

A dryer is operated with a material containing 10% H2O (by mass) to a final dried material containing 5% H2O (by mass). The fresh air is mixed with recycled air and is blown over the solid. The fresh air contains 0.008 kg H2O/kg dry air and the recycled air contains 0.08 kg H2O/kg dry air. For 1000 kg of wet material fed to the dryer. Calculate (a) weight of H2O removed, (b) weight of dry air in the fresh air feed and (c) weight of dry air recycled.

Consider the following reaction:  2 A + 3 B2 ⇌ A2B6

The initial concentrations of A and B2 are 0.245 M and 0.730 M, respectively, with no A2B6 initially present. When the reaction comes to equilibrium, the concentration of A2B6 is found to be 9.50×10−2 M.

Part A

What is the equilibrium concentration of A?

Round your answer to 3 significant figures.

Part B

What is the equilibrium concentration of B₂?

Round your answer to 3 significant figures.

Part C

What is the value of the equilibrium constant?

Round you answer to 3 significant figures.

Problem: Two primary batteries are based on the cell reactions as follows:

2 MnO₂ + Zn + 2NH₄Cl -> Mn₂O₃ + Zn(NH₃)₂Cl₂ + H₂O

and

2Li + 2SO₂ -> Li₂S₂O₄

that have free energies of -229 Kj/mol of Zn and -294 Kj/mol of Li, respectively. Typical batteries have a capacity of 2 Ah (ampere hours). Estimate the battery voltages and the weights of the two metals needed to deliver this capacity. Do your calculations reveal any advantages for Li battery? (Atomic weights of Zn and Li are 65 and 7, respectively.)

A mixture is made by combining 19.9 mL of 1.2×10−3 M KSCN, 8.5 mL of 8.1×10−2 M Fe(NO3)3, and 11 mL of 0.198 M HNO3. Calculate the concentration of Fe3+ in the solution.

what the ph of 0.109 M hydrogen chromate ion (HCrO4^-)

The concentration of grain alcohol (C₂H₅OH) in whisky is given in "degrees proof", which is twice the percent alcohol by volume (v/v). What are the mole fraction and molality of C₂H₅OH in 80.

One way of achieving an IPSP is to increase permeability to Cl^-. By what other mechanism can you achieve an IPSP (change permeability to what ion)? Explain why.

PLEASE answer this question COMPLETELY and I'll be sure to give you five star feedback!