A 0.10 mol sample of AgNO3 is dissolved in a 1.00 L of 1.00 M NH3 (aq) solution. If 0.010 mol NaCl is added to this solution, will AgCl(s) precipitate? Show the procedure by which you arrive at your answer. Given that Kf of [Ag(NH3)2] + = 1.6 x 10^7 and Ksp of AgCl = 1.8 x 10^10 .

(a) If the molar solubility of Cd3(PO4)2 at 25 oC is 1.19e-07 mol/L, what is the Ksp at this temperature?

Ksp =

(b) It is found that 0.00178 g of Ag3PO4 dissolves per 100 mL of aqueous solution at 25 oC. Calculate the solubility-product constant for Ag3PO4.

Ksp =

(c) The Ksp of Sc(OH)3 at 25 oC is 2.22e-31. What is the molar solubility of Sc(OH)3?

solubility ________= mol/L

Hydrochloric acid (HCl) reacts with sodium carbonate (Na2CO3), forming sodium chloride (NaCl), water (H2O), and carbon dioxide (CO2). This equation is balanced as written: 2HCl(aq)+Na2CO3(aq)→2NaCl(aq)+H2O(l)+CO2(g)

Part A: What volume of 2.75 M HCl in liters is needed to react completely (with nothing left over) with 0.750 L of 0.400 M Na2CO3?

Part B: A 675-mL sample of unknown HCl solution reacts completely with Na2CO3 to form 18.1 g CO2. What was the concentration of the HCl solution?

4- Aspirin can be made in the laboratory by reacting acetic anhydride (C₄H₆O₃) with salicylic acid (C₇H₆O₃) to form aspirin (C₉H₈O₄) and acetic acid (HC₂H₃O₂). The balanced equation is:

            C₄H₆O₃   +   C₇H₆O₃     →     C₉H₈O₄   +   HC₂H₃O₂

            In a laboratory synthesis, a student begins with 3.00 mL of acetic anhydride (density = 1.08 g/mL) and 1.25 g salicylic acid. Once the reaction is complete, the student collects 1.22 grams of aspirin.Determine the limiting reactant, theoretical yield of aspirin, and percent yield for the reaction.

5.         Combustion analysis of a 13.42 g sample of equilin (which contains only carbon, hydrogen and oxygen) produces 39.61 g of CO₂ and 9.01 g of H₂O. The molar mass of equilin is 268.34 g/mol. Find the molecular formula of equilin.

Examine the effects of the detergent sodium dodecyl sulfate (SDS) on the binding activity of serium albumin (this detergent is a strong protein denaturant).

In a isolation of organic compounds phenanthrene, methyl 4-aminobenzoate and 1,4-dibromobenzene was dissolved in diethyl ether. HCl was used to separate the aqueous and organic layer. The aqueous layer contains methyl 4-aminobenzote +H⁺ +Cl^-. 6M NaOH was added to the aqueous layer, methyl 4-aminobenzote + water and NaCl was yield after the NaOH addition. This was followed by the addition of dichloromethane. After this addition you have two layers: one layer contains methyl 4-aminobenzoate + water +dichloromethane, the other layer contains water and NaCl.

(1)Can you explain and draw the reaction that takes place when HCl is added? Why was it necessary to add HCl?

(2)Can you explain and draw the reaction that happens when NaOH is added? why was it necessary to add NaOH?

(3) in a flask you had two layers one contained methyl 4-aminobenzoate, water and dichloromethane and the other layer contained water and NaCl. How can you identify the aqueous layer from the organic layer. Which layer is on top and which layer is on the bottom and why?

(4) when doing a crystallization a student is given a flask with phenanthrene, 1,4-dibromobenzene and diethyl ether. The solvent of choice for the crystallization is ethyal alcohol. Can you draw the reaction that takes place when ethyl alcohol is added to the flask containing: phenanthrene, 1,4-dibromobenzene and diethyl ether? Why was ethyl alcohol the solvent of choice? Do you think there is a better solvent of choice?

HMN Item 1921

Part A

A 2.52 g lead weight, initially at 11.0 ∘C, is submerged in 8.15 g of water at 52.3 ∘C in an insulated container.

What is the final temperature of both the weight and the water at thermal equilibrium?

Part B

A silver block, initially at 60.0 ∘C, is submerged into 100.0 g of water at 25.1 ∘C, in an insulated container. The final temperature of the mixture upon reaching thermal equilibrium is 27.3 ∘C.

What is the mass of the silver block?

Vapor Pressure of pure ethanol is 40.0 torr at 19 degrees C

3.42g of sugar (C12H22O11, non-volatile, non-electrolyte) is added to 50.0 mL of ethanol (C2H6O, 0.79 g/mL, melting point = -114 degrees C, Kf = 1.99 degrees C/m)

a. Calculate the vapor pressure of the sugar/ethanol solution @ 19 degrees C.

b. Calculate the melting point of the sugar/ethanol solution.

A mixture of 20.6g of phosphorus (P) and 79.4 chlorine (Cl2) reacts completely to form phosphorus trichloride (PCl3) and phosphorus pentachloride (PCl5).

(a) true or false: the bond angels of PCl3 and PCl5 are identical.

(b) what mass of PCl3 forms under the conditions described above?

(c) an analysis of a phosphorus and chlorine containing compound found that it was 30.40% phosphorus. is it one of the two products formed in this reaction? why pr why not?

Consider the titration of 80.0 mL of 0.0200 M NH₃ (a weak base; K_b = 1.80e-05) with 0.100 M HBrO₄. Calculate the pH after the following volumes of titrant have been added:

(a) 0.0 mL (d) 12.0 mL

(b) 4.0 mL (e) 16.0 mL

(c) 8.0 mL (f) 17.6 mL

correctly list the molecules in order of increasing boiling point (from lowest to highest)?

a.)CH3CH2CH2-OH

b.)CH3CH2CH2CH3

c.)CH3CH2-OH

I know the the answer wold be b,c,a but I don't understand why

Given the following acids or bases. 1) H2PO4 -2 2) CH3NH3 a. Write the reactions for each of the above b. Write the K expressions for the reactions and look up the K for each of the above. c. What is the conjugate of each of the above? (there may be more than one) d. Write the reaction for the conjugate interacting with water. e. Write the K expressions for the reactions that involves the conjugate and calculate the value of the K.

Find the effective nuclear charge for the 2s electrons in the Lithium atom. How much does each 1s electron shield the 2s electron from the nucleus?

Calculate the solubility (in mol/L) of lead(II) chloride, PbCl2, at 25 degrees celsius. Ksp = 1.59 x 10^-5