Chem 209 quiz 1 - Study guides, Class notes & Summaries

CHEM 209 Quiz 1 Latest Update Graded A+ Question: What is a back titration? - a. A method where excess titrant is added first and then the remaining is titrated - b. A titration where the initial solution is known and the excess is titrated carefully - c. A technique involving titration with a known excess of titrant, followed by titration of the excess - Answer: c. A technique involving titration with a known excess of titrant, followed by titration of the excess Explanation...

Calculate the pH of a 0.10M HOAc (acetic acid) solution. - Answer-pH = -log(.10) = 1 Calculate the pH of each of the following solutions: a. 0.10M HCl b. 2.0x10^-4M HNO3 c. 0.015M NaOH d. 12M HCl - Answer-Use equation: pH = -log(molarity) a. 1 b. 3.7 c. 12.17 d.-1.1 Calculate the total number of moles of acid in 33.6 mL of 0.10M HCl and 0.10M H2SO4. - Answer-.00336 mol each Calculate the total number of moles of base in: a. 675 mg CaCO3 b. 135 mg Mg(OH)2 - Answer-a. 0.00674 b. 0.0...

CHEM 209: QUIZ 1 with Complete and Verified Answers 1. What is a "back titration"? Answer: It's a technique where the concentration of an analyte is determined by reacting it with an excess of a known reagent. 2. What is the balanced chemical equation for the complete reaction between CO32− and HCl? Answer: CO32−(aq) + 2H+(aq) → H2O(l) + CO2(g) 3. What is the balanced chemical equation for the complete reaction between KHP (KHC8H4O4) and NaOH? Answer: KHC8H4O4(aq...

What is the Bronstead-Lowry definition of an Acid? - ️️They are proton DONORS! [H+] What is the Bronstead-Lowry definition of a Base? - ️️They are proton ACCEPTORS! [H+] Example/further description of Bronstead-Lowry Acids - ️️These give AwAy protons; emphasis on the A's.... "A.P.A." Example/further description of Bronstead-Lowery Bases - ️️protons Belong to them, they Bring them in... emphasis on the B's.... "P.B.B." What is a STRONG Base and Acid? -️️These diss...

CHEM 209 Quiz 3 Latest Update with Verified Solutions Provide a diagram illustrating the key components of a GC instrument. Answer: Reservoir for Mobile Phase (pressurized helium cylinder) -> Oven -> Sample Injector (micro-syringe) -> Stationary Phase (column) -> Detector (thermal conductor or flame ionization detector) -> Readout (computer) What variables are typically plotted on the x- and y- axes of (a) a chromatogram and (b) a calibration curve? a. x: time, y...

What are Bronsted-Lowry acids and bases? -️️acids are proton donors and bases are proton acceptors. What is the difference between a strong acid and a weak acid? Give three examples of each - ️️For strong acids all substances would break down when acid is put into water. With weak acids only a few molecules would break apart when dissolved into water. Strong acids- HCL, HCLO3, H2SO4 Weak acids- H20, C2H2O4, HNO2 What is the difference between a strong base and a weak base? Give tw...

Bronsted-Lowry acid -️️electron pair acceptor & p+ donor Bronsted-Lowry base -️️electron pair donor & p+ acceptor Strong acid - ️️dissociates fully in water (higher [H+]) Weak acid -️️partially dissociates in water (lower [H+]) Strong base -️️100% ionized in solution Weak base - ️️<100% ionized in solution HCl (hydrochloric), HNO3 (nitric), H2SO4 (sulfuric) - ️️strong acids

What is a back titration? - ️️A titration in which a known excess of titrant is added and then the excess is carefully titrated. What is the balanced chemical equation for the complete reaction between CO3 2- and HCl? Between KHP and NaOH? SHOW THE NET IONIC EQUATIONS. - ️️2HCl(aq) + CO3 2-(aq) ---> H2O(l) + CO2(g) + 2Cl-(aq) 2H+(aq) + CO3 2-(aq) ---> H2O(l) + CO2(g) KHP(aq) + NaOH(aq) ---> NaKP(aq) + H2O(l) KHP(aq) + OH-(aq) ---> KP-(aq) + H2O(l) Calculate the total ...

What is a back titration? - ️️A titration in which a known excess of titrant is added and then the excess is carefully titrated. What is the balanced chemical equation for the complete reaction between CO3 2- and HCl? Between KHP and NaOH? SHOW THE NET IONIC EQUATIONS. - ️️2HCl(aq) + CO3 2-(aq) ---> H2O(l) + CO2(g) + 2Cl-(aq) 2H+(aq) + CO3 2-(aq) ---> H2O(l) + CO2(g) KHP(aq) + NaOH(aq) ---> NaKP(aq) + H2O(l) KHP(aq) + OH-(aq) ---> KP-(aq) + H2O(l) Calculate the total ...