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Acids and Bases

Lewis Acids and Bases

Question 1: Using the Lewis concept of acids and bases, identify the Lewis acid and base in each of the following reactions: 1. Al(NO3)3 a) Lewis Acid b) Lewis Base c) Neither 2. H2O a) Lewis Acid b) Lewis Base c) Neither 3. CH3NH2 a) Lewis Acid b) Lewis Base c) Neither 4. HBr a) Lewis Acid b) Lew

PH and Indicator Lab Report

PH Indicator Procedure #1 pH Indicators for Acids: 1. Take seven clean test tubes from the Glassware shelf and place them on the workbench. 2. Add 5 mL of 0.1M HCl and 5 mL of water from the Chemicals shelf to the first test tube. 3. Add 9 mL of water to the 6 remaining test tubes. 4. Pour 1 mL of the solution fr

Calcite in Seawater : pH, Calcium Ion and Carbonate Concentration

Please see the attached file for the fully formatted problems. KH = 3.3 x 10-7 Ka1 = 4.5 x 10-7 (carbonic acid) Ka2 = 4.7 x 10-11 (bicarbonate) Ksp = 5 x 10-9 (calcite) Assuming equilibrium between the atmosphere, seawater, and calcite: [H+]3 = KH2Ka12Ka2PCO22 2Ksp [HCO3-] = 2Ksp{H+]2

Antacids : Gram Equivalent of Hydroxide Ion

Problem: Using the equivalent millimoles HCl/mg sample, the stoichiometry of reaction of HCl with NaOH (which I know is 1:1), and the molar mass of the hydroxide ion, report the gram equivalent OH- per gram of ...there is moreshow problem Using the equivalent millimoles HCl/mg sample, the stoichiometry of reaction of HCl with

Lead Solubility

Please provide solution for (a) and (b) with explanation of how it was derived. Early groups used Pb plumbing in their homes more than 2000 years ago. This Pb pipe has since corroded in the soil to form cerrusite (PbCO3) and hydrocerrusite ( Pb3(CO3)2(OH)2 ). Essington et al., 2004. The soil mineralogy of lead at Ho

Strong and Weak Acids, Ka and Concentration of Species in Solution

Sulfuric acid H2SO4(aq) is described as a strong acid whereas hydrofluoric acid HF(aq) is described as a weak acid. (a) (i) Describe what is meant by the terms strong and weak acid. (Two or three short sentences) (ii) Write fully balanced equations for the equilibrium dissociation of both sulfuric and hydrofluoric acids in

Solutions : Acids, bases, Salts, pH and Concentration

Label each of the following as an acid, base or salt, explaining your answer: a. KOH b. HCl c. Ba(OH)2 d. H3PO4 e. FeSO4 2. Calculate the pH of the following solutions with the given [H+] or [OH-] and indicate whether it is an acid or base: a. [OH-] = 0.01 b. [H+] = 0.001 c. [OH-] = 0.0

Titrations : pH at Different Points in the Titration

Consider the following titrations: a. 50.0 mL of 0.100 M HClO4 titrated by .0500 M KOH b. 60 mL of 0.400 M HF titrated by 0.800 M RbOH For each of the titrations, determine the pH: i. Initially, before any titrant has been added ii. At the halfway point to equivalence iii. At the equivalence point.

Buffer solution

I have four problems that I don't understand how to figure out. I've done problems 16-20 but don't know how to do 21-24. I've attached the whole page from the exam for the information it provides. I've boxed my previous answers in case they are needed to figure out the four questions. I need help on the third page. The secon

Solutions : pH Levels

Please see the attached file for the fully formatted problems. 1. Estimate the pH of the following, based on the indicator colors given: Solution Tested Bromocresol Green (indicator color) Bromothymol Blue (indicator color) Estimated pH Distilled water Blue Yellow

How to write a chemistry lab report

A full lab report, including propagation of error, with instructions on what belongs in each section (abstract, introduction, experimental, results and discussion, acknowledgments, references, and appendices). This sample lab concerns the determination of the percent chloride in a soluble unknown, but has general notes for each

Oswald Process: Find the Percent Yield

The first step in the Oswald process for producing nitric acid is: 4NH3(g) + 5O2(g) > 4NO(g) + 6H2O(g) If the reaction of 150 g of ammonia with 150 g of oxygen gas yields 87g of nitric oxide(NO), what is the percent yield of this reaction?

Neutralization reaction

Oxalic acid H2C2O4 is a diprotic acid. Calculate the mass of acid in a solid given that a 0.7984 g sample of that solid required 45.00 mL of 0.300 M NaOH for neutralization.

Using indicators to measure acidity

Please help with the following multiple choice questions regarding acids and bases. You have two neutral solutions. One contains the indicator methyl red, which turns red in strongly acidic aqueous solutions but is otherwise yellow. The other contains the indicator phenol red, which turns red in strongly basic aqueous soluti

Acid/base equilibrium

Methyl red is a common acid-base indicator. It has a Ka equal to 6.3 e -6. Its unionized form is red and its anionic form is yellow. What color would a methyl red solution have a pH = 7.8? red yellow blue violet green For this problem I am confused on how to start... Can you please help me?

PH and Monoprotic Weak Acids

You are given a vial of unknown monoprotic weak acid. You weigh out .5000g of the acid and dissolve it in pure water to make a final volume of 100 ml. Your instructor requires you to use the entire 100.0 ml of acid solution in a single titration trial. In this trial, it takes 27.24 ml of .1500 M NaOH to reach the equivalence p

PH Titrations

In a buffer solution, a constant solution pH is maintained regardless of the amount of acid or base added. True or False?

PH Titrations

A certain aqueous solution contains 6.0 e -6 moles of dissolved KSCN. This solution occupies a total volume 50.0 ml. What is the concentration of SCN-?

Heat Capacity of a Calorimeter

Benzoic acid (C6H5COOH) is sometimes used as a standard to determine the heat capacity of a bomb calorimeter. When 1.44 g C6H5COOH is burned in a calorimeter that is being calibrated, the temperature rises from 19.18 degrees Celsius to 22.93 degrees Celsius. What is the heat capacity of the calorimeter? The heat of combusti

Answering Questions Regarding Equilibrium

1. Given the following reaction H2(g) + I2 (s) = 2HI (g) ¤h = + 68.0 KJ/mol A) Write the Kc expression. B) State whether the number of moles of H2 (g) in the container will increase, decrease, or remain the same after each of the following disturbances is applied to the original mixture. For each case, assume that al

pH and Ka of lactic acid

3. Lactic acid, HC3H5O3, is a monoprotic acid that dissociates in aqueous solution, as represented by the equation(not given). Lactic acid is 1.66 % dissociated in 0.50M HC3H5O3. (aq) at 298K. A) Write the expression for the acid- dissociation constant , Ka , for lactic acid and calculate its value. B) Calculate the pH

Hich of these salts will be more soluble in 0.10M HCl than in pure water

13. Which of these salts will be more soluble in 0.10M HCL than in pure water A. PbCL2 B. NH4I C. CuBr D. Zn(HCO3) E. None of the above Explain your answer .......................................................................................................... 14. HA is an acid with a Ka = 1 x 10-5. What is