Share
Explore BrainMass

# Acids and Bases

### Chemical Quantities Problems

Please provide the exact steps that are involved in solving each of these problems and how to arrive at the answers step-by-step so I can grasp the concept clearly. 1. The gaseous hydrocarbon acetylene, C2H2, is used in welders torches because of the large amount of heat released when acetylene burns with oxygen, producing ca

### Acidity and Undissociated Acid

A weak acid has a pKa of 3.654. If the solution pH is 3.741, what percentage of the acid is undissociated? A weak acid has a pKa of 5.857. Calculate the pH of a solution in which the ratio of the concentrations of acid anion to undissociated anion ([A-]/[HA]) equals 7.555.

### Chemical equations- the Ka and Henderson Hasselbalch equation

Please help, I'm really stuck on the following:- A weak acid has a PKa of 7.713. Calculate the pH of a solution in which the ratio of the concentrations of undissociated acid to acid anion ([HA]/[A-]) equals 8.441 also Calculate the PKa of a weak acid given the information that a 0.652 M solution has a pH of 2.882

### Oxidation and reduction problems

1) When iron is oxidized in the presence of nitric acid, three products are formed: iron(III) nitrate, nitrogen dioxide and water. Write and balance the equation for this reaction. Then calculate how many grams of water are formed if 500 grams of iron are reacted with 500 grams of nitric acid. 2) When iron is oxidized in th

### Aqueous Solutions

The only possible ions in an aqueous solution are ion, barium, carbonate, chloride and nitrate. The following are observed: i) the original solution contains only dissolved species. ii) adding silver ion to the solution produces no precipitates. iii) adding sulfate ion to the original solution produces a white precipitate

### Equilibrium; Ionization; Concentration

Please see the attachment for complete information. 15. Into a 5.0 liter flask was placed 35.7 g of PCI5 . The flask and contents were heated to 250 0 C, and then held at temperature until the following equilibrium was established: PcI5 (g)< > Pc13 (g) + Cl2 (g) It was then shown by analysis that 875 g of Cl2 was pesent

### Concentration of an Acid after Titration

During titration the following data were collected. A 50mL portion of an HCl solution was titrated with 0.50 M NaOH. It required 200mL of the base to neutralize the sample. How many grams of acid are in 500 mL of this acid solution? The attached solution describes all steps of the required procedure to find out the unkonwn a

### Metals reacting with acids and metal ions. Finding how redox equations have to be solved.

Reactions of metals with acids and metal ions. 1. What are the equations for these metals when mixed with 6 M HCl. Ca, Cu, Mg, Fe, Sn, and Zn. (I tried Ca + HCl and got 3 Ca + 6HCl --> 3CaCl2 + 3H2) 2. We have Ca(NO3)2, Cu(NO3)2, FeSO4, Fe(NO3)3, Mg(NO3)2, SnCl4, and Zn(NO3)2. What is the complete equation and net ion

### Solutions/Acids/Bases

What volumes of 0.50 M HNO2 and 0.50 M NaNO2 must be mixed to prepare 1 liter of solution buffered at Ph of 3.55?

### Acid-Base Reaction Problem

An aqueous solution contains dissolved C6H5NH3Cl and C6H5NH2. The concentration of C6H5NH2 is 0.50 and pH is 4.20. a. Calculate the concentration of C6H5NH3+ in this buffer solution. b. Calculate the Ph after 4.0 grams of NaOH(s) is added to 1.0 L of this solution. Neglect any volume change.

### Acid Equilibrium: Titratable Acidity

Question: If 500 mg/L lactic acid is added to pure water and you add NaOH until the pH = 3.1, what are the final amounts of each species in the acid equilibrium? What is the titratable acidity? The formula for lactic acid is C3H603, with a dissociation constant, pKa = 3.86. The formula for tartaric acid is C4H606. We us

### Spectator Ions Questions

1) How many moles of chloride ions are in 250.0mL of a 0.450M calcium chloride solution? 2) Identify the spectator ions for the reaction: CuBrsub2 (aq) + Lisub2CrOsub4(aq) -> CuCrOsub4(s) + 2LiBr(aq)

### Acid / Base Reactions (Moles, Volume etc.)

4. a) Write the equation for the reaction of sulfuric acid with potassium hydroxide. b) If Ms. Chemist has a solution of potassium hydroxide that is 0.68 M, what is the volume (in mL) of the base needed to react completely with 55.0 mL of 2.45 M sulfuric acid? c) How many grams of acid were needed to make up the acidic sol

### Solvents and solubility rules

21. One gram of NaCl and one gram of sand are added to 100mL of water. What is the solvent? NaCl Sand Water The Na and Cl ions 22. The gradual mixture of one gas with another by kinetic energy is termed diffusion. True False 23. Which of the following compounds is an acid? H2O N2

### Ostwald process

Using Ostwald process, what mass of nitric acid could be produced from 75.0 g of N2 and 50.0 g of H2? I have all the molar masses, the limiting factor, and the ratio of the limiting factor to the product. How do I put this information into an equation to come up with a reasonable answer?

### Percent by mass of palmatic acid in Commercial steric acid

Commercial steric acid (C17H35COOH) contains palmatic acid (C15H31COOH) as an impurity. If a 1.115 gram sample of commerical steric acid is dissolved inm 43.95 grams of benzene, the freezing point is found to be 5.072 degrees celcius. If the freezing point of pure benzene is 5.533 degrees celcius what is the percent by mass of

### Converting Units of Measure and Chemical Formulas

1. How many grams of CI2 can be prepared from the reaction of 15.0 g of MnO2 and 30.0 g of HCl according to the following equation? 2. How many mL is 0.005 L? 3. Give the number of protons (p), electrons (e), and neutrons (n) in one atom of chlorine - which has the symbol Cl. 4. A newborn baby weighs eight and one ha

### Writing Chemical Equations

Write a chemical equation for the following reactions: i) zinc sulphate + barium nitrate ii) gold (III) sulphate + barium chloride iii) zinc + mercourous nitrate iv) tin + antimony (V) chloride v) calcium + water vi) ferrous bromide + phosphoric acid vii) calcium carbonate + hydrobromic acid &#8594;

### Solubility at Equilibrium of AgOH

10.0 mg of AgOH(s) is added to 350.0 mL of water with an initial pH of 11.00. The solubility equilibrium constant for the dissolution of AgOH (s) is Ksp = 1.5 x 10^-8. Determine the concentration of [Ag +] and the final pH at equilibrium.

### Boric Acid and its Conjugate Base

Boric acid, B(OH)3, is an acid that acts differently from normal Bronsted-Lowry acids. It reacts with water to form B(OH)4- and H30+. a) Draw Lewis structures and indicate the shapes for B(OH)3 and B(OH)4- b) What is the species that donates a proton to water? c) Can B(OH)3 be described as a Lewis acid?

### Amount of Coal Needed to Produce a pH of 2

How many metric tons of 5%-S coal would be needed to yield the H2SO4 required to produce a 5.0 cm rainfall of pH 2.00 over an area of 100 square kilometers? Hint: calculate the volume of rain, mol H+, mass of S, mass of coal. If you could work out the problem for me, that would be great! It makes it easier to understand.

### How Many Grams of Molecules Can Be Formed?

In the lab you add excess hydrochloric acid to 2.65g of Na2CO3. The balanced reaction is 2HCL (aq) + Na2CO3 (aq) ---> CO2 (g) + H20 (l) + 2NaCl (aq) 1) Identify the type of reaction 2) How many grams of gas molecules can be formed from this much Na2CO3? Show the calculation of the molar masses of all necessary substances

### Molarity

Question: 5.0 mL of 12 mol NH3 / Litre solution is added to 500.0 mL of 0.050 mol AgNO3 / Litre solution. Assume the combining volumes are additive, What molar concentration of silver ion will exist in solution after equilibrium is established? Ag+ + 2 NH3 = Ag(NH3)2+ ( Kf for Ag(NH3)2+ is 1.5 x 107 ) P

### Net Ionic Equations, Self-Ionization, Equilibrium, Conjugate Pairs and Isoelectronic Ions

1. Write net ionic equations to correspond with each of the following molecular equations. (a.) HCl(aq) + NaOH(aq) NaOH(aq) + H2O(l) (b.) Na2CO3(aq) + CoCl2(aq) 2 NaCl(aq) + CoCO2(s) (c.) NH3OH(aq) + CH3COOH(aq) CH3COONH4(aq) + H2O(l) 2. Define the following terms: (a.) conjugate acid-base pairs (b.) self-ionization

### Mass of potassium hypochlorite

What mass of potassium hypochlorite must be added to 450.0 mL of water to give a solution with pH = 10.20? Please see the attached file for full problem description.

### Buffer effective

Over what range of pH is a HOCl - NaOCl buffer most effective? pH 2.0 - pH 4.0 pH 7.5 - pH 9.5 pH 6.5 - pH 8.5 pH 6.5 - pH 9.5 pH 1.0 - pH 14.0

### Lab Report: Reaction Order and Rate Laws

Objective: To study the effect of reactant concentration on the rate of the reaction between sodium thiosulfate and hydrochloric acid and to determine the order of each reactant and the rate law for the reaction. 2 HCI(aq) + NaS2O3 (aq) --> S(s) + SO2 (aq) + H2O(l) + 2NaCL(aq) Calculations: (a) Calculate the initial an

### Back titration of ammonium chloride

In a labratory. A solution of Ammonium chloride was given, for us to find the concentration by techniques of back titration. NaOH was added to the diluted ammonium chloride and heated. Then Titrated with HCL adding few drops of bromocresol green indicator. Colour turned yellow. What does this mean? I have done the calculation.

### Empirical Formula of the Compound

A compound of iron and oxygen is found to have a mass of 6.13 grams. If the mass of iron is determined to be 4.29 grams, what is the empirical formula of the compound? Please give step by step answer in simplest way to do not making it complicated. Show all steps and solution please.... (See attachment for rest of question

### MOLARITY of Sodium hydroxide solution

Sodium hydroxide is used extensively in acid-base titrations because it is a strong, inexpensive base. A sodium hydroxide solution was standardized by titrating 28.71 mL of 0.1822 M standard hydrochloric acid. The initial buret reading of the sodium hydroxide was 2.70 mL and the final reading was 30.33 mL. What was the molarity