Chemistry Answers

A CAPE Chemistry student sought to determine the solubility product, Ksp of calcium hydroxide by titrating saturated solution of Ca(OH)2 against standardized hydrochloric acid solution, HCl. The saturated Ca(OH)2 solution was filtered, to remove excess solute, and 25mL aliquots were titrated against 0.10M HCl solution using bromothymol blue indicator. 

Ca(OH)2(s)   ↔   Ca2+(aq)   +   2OH-(aq) 

A)Calculate the concentration of Calcium Hydroxide.

B)Use the equilibrium expression for the dissolution of Ca(OH)2 to determine the concentration of Ca2+ and OH–.

the reaction of diatomic fluorine gas with compound X yields a single product, compound Y. The mass percent composition of the product, compound Y is 61.7%F2 and 38.3%CL. What is the empirical formula for compound x?

Direction: Answer the following questions:

1. What unit is used to describe reaction rate?\

2. In a reaction between Mg and hydrochloric acid

Mg (s) + HCl (aq) --> MgCl₂ (aq) + H₂ (g)

The data below was recorded. Examine the data. What is the average rate of reaction?

Time Mass of Magnesium

0 0.012

2 0.010

6 0.006

8 0.004

what is the maximum amount of SF₄ that can be made in the reaction 16.87g of NaF and 98.42g of SCI₂

Calculate the molar mass of powdered fruit drink mix, made from sucrose (C₁₂H₂₂O₁₁).

Iron can be extracted from haematite, Fe2O3, using either C or CO2 as the reducing agent. The reactions are shown below.

Fe2 O3 (s) + 3 C(s) → 2 Fe(s) + 3 CO(g) ΔH = +492.7 kJ /mol Fe2 O3 (s) + 3 CO(g) → 2 Fe(s) + 3 CO2 (g) ΔH = - 24.8 kJ/mol Substance S° (J/ K·mol) Fe2 O 3 (s) 87.4 Fe (s) 27.3 C (s) 5.7 CO (g) 197.6 CO 2 (g) 213.6 Use available data given to:

1. Calculate the minimum temperature at which reduction with carbon is feasible

2. Prove by calculation that reduction with carbon monoxide is feasible at all temperatures.

4 Titration of 0.2121 g of pure Na2C2O4 required 43.31 mL of KMnO4. What is the molar concentration of the KMnO4 solution? The chemical reaction is MnO4- + C2O42- + H+ ----------> Mn2+ + CO2 + H2O (unbalanced equation) Atomic masses: Na = 23 C = 12 O = 1

1 . What is the concentration of HCl if it takes 63.0mL of 0.1 M NaOH to neutralize 140mL of the acid?

2 . If it takes 58.5mL of of 0.5 M potassium hydroxide to neutralize 135 mL of sulfuric acid, what is the concentration of the acid?

3 Describe the preparation of 2.00 L of 0.0500 M AgNO3 from the primary standard grade solid. Atomic masses: Ag = 108 N = 14 O =16

1.What is the concentration of HCl if it takes 63.0mL of 0.1 M NaOH to neutralize 140mL of the acid?

2. If it takes 58.5mL of 0.5 M potassium hydroxide to neutralize 135 mL of sulfuric acid, what is the concentration of the acid?

3. Describe the preparation of 2.00 L of 0.0500 M AgNO3 from the primary standard grade solid. Atomic masses: Ag = 108 N = 14 O =16

The molar cconcentration of a solution of ammonium molibdate in an aqueous solution which contains 48 parts per million of MoMolybdenum is?