A chemistry graduate student is given 300. mL of a 1.40M ammonia (NH, solution. Ammonia is a weak base with K, = 1.8 x 10°. What mass of NH,Br should the student dissolve in the NH, solution to turn it into a buffer with pH =9.81? You may assume that the volume of the solution doesn't change when the NH, Br is dissolved in it. Be sure your answer has a unit symbol, and round it to 2 significant digits.

Q: A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains Du...

A: heat flows from out of the flask means heat given out by the reaction and that heat is taken by the ...

Q: Be sure to answer all parts. Industrially, vanadium metal, which is used in steel alloys, can be obt...

A:

Q: 2. If a sample known to be about 17190 years old has 400 carbon-14 atoms, how many atoms were in the...

A: When organism died absorption of C-14 stops and starts diminishing. The radioactive decay follows fi...

Q: Select the single best answer. Which of the following has more atoms: 3.13 g of hydrogen atoms or 17...

A:

Q: The pKa of acetone, CH;COCH3, is 19.3. Which of the following bases is strong enough to deprotonate ...

A:

Q: When 0.7521 g of benzoic acid was burned in a calorimeter containing 1,000. g of water, a temperatur...

A: Mass of benzoic acid burned is = 0.7521 g The heat of combustion of benzoic acid s= -26.42 kJ/g

Q: Decide whether each molecule or polyatomic ion is polar or nonpolar. If the molecule or polyatomic i...

A: ★ F2 :  F2 is homonuclear diatomic molecule which is non polar . A homonculear diatomic molecule F2 ...

Q: the isommeric fonship between tne mo Your choices are dieastereomers, enantiomers, identical, or con...

A: Isomers are compounds which have same chemical formula or numbers of atoms but differ in structures ...

Q: Which of the following has more atoms: 3.55 g ef lithium atoms or 19.1 g of nickel atoms?

A: Mass of lithium = 3.58 g Mass of nickel = 19.1 g

Q: 2. What is the mass (in grams) of 7.11 X 102 molecules of tetraphosphorous trisulfide?

A: Given, number of molecules = 7.11×1022 Avogadro's constant = 6.022×1023 molecules.mole-1

Q: 0.04 nm 104° +) A) Suppose the center of a water molecule was positioned 1.0nm away from a 2nC posit...

A: A) As we know, a charge is a source of e ll electric field,in which electric dipole (water molecule ...

Q: A bicyclist is stopped at the entrance to a valley, as sketched below: A Where would the bicyclist h...

A: The potential energy is the point at which the bicyclist has the highest energy. It is at point F. T...

Q: 8- Calculate the molar concentrations of the solute species in an aqueous solution that contains 285...

A:

Q: heat flows out of the bath and into the flask. -1 ·K Calculate the new temperature of the water bath...

A: Mass = 4.60 kg

Q: If a red and green solution are mixed and an orange mixture esults, is this evidence of a physical c...

A: Physical change is the change in which physical property of the compound changes and it is reversibl...

Q: A bicyclist is stopped at the entrance to a valley, as sketched below: E Where would the bicyclist h...

A:

Q: what compound is this based in the IR spectroscopy

A: IR spectra of a compound helps us to know the class of organic compounds, to which it belongs.   IR ...

Q: c. 1.520M HCN solution, KA= 4.12x 10 d. 3.85 x 10° M CH,NH, solution that is 0.900% ionized e. 2.35 ...

A:

Q: mole fraction: sulfur hexafluoride partial pressure: atm mole fraction: carbon monoxide partial pres...

A:

Q: The van der Waals equation of state was designed (by Dutch physicist Johannes van der Waals) to pred...

A:

Q: 3. How many water molecules are in 2.00 liters of water? The density of water is 1.00 g/mL.

A: Density of water = 1.00 g/mL It means 1.00 mL water contains 1.00 g

Q: A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 5....

A:

Q: Increasing the temperature of the water by 5 °F would have a significant impact on cooking times. As...

A: Desired boiling point of water = 217 oF Volume of water/solution = 4 quarts The question requires to...

Q: Be sure to answer all parts. How many moles of cobalt (Co) atoms are there in 9.00 x 10° (9.00 billi...

A:

Q: What concentration of Cu2+ is needed to have a concentration of Cu(CN)42- equal to 2.0 × 10-5 M in a...

A:

Q: calculate the molality m of 1000 g of a -7 solution contain 100 g of solute(NaCl) and ? 900g of solv...

A: Use the molality formula to calculate molality of the given solution. First calculate moles of solut...

Q: Which of the following statements does NOT explain why KHP is a suitable primary standard in an acid...

A:   KHP is a suitable primary standard in an acid-base titration. Here we have to find out the stateme...

Q: How many protons, neutrons, and electrons are there in a neutral atom of 113In (indium-113)?

A: Atomic number of indium = 49 Atomic mass of indium = 113

Q: Mass of beaker 50.5g Mass of marble before reaction 3.0g Mass of marble after reaction 1.8g Vo...

A: The Chemical reaction follows the law of conservation of mass. According to the law of conservation ...

Q: QUESTION 1 During an experiment, a student mixed 14.5 mL of a 0.500 M sodium fluoride solution with ...

A:

Q: A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 3....

A: The mass of water in the water bath is = 3.30 kg The initial temperature of the water bath is = 31.8...

Q: a) Why do oxygen atoms exist longer at 120-km altitude than at 50-km altitude?

A: At higher altitude oxygen atoms exists longer.

Q: Mass of beaker 50.5g Mass of marble before reaction 3.0g Mass of marble after reaction 1....

A: Formula of marble CaCO3 Chemical reaction CaCO3 (s)  + 2 HCl (aq) →CaCl2 (aq) + CO2 (g) + H2O (l) M...

Q: 5. Calculate the vapor pressure of water above a solution prepared by adding 22.5 g of lactose (C12H...

A:

Q: Which of the following is NOT true about equivalence point and endpoint? a. The endpoint approximate...

A: Endpoint and equivalent point in a titration are two very important point. Here we have to determine...

Q: 5.0 g of solid silver iodide (Agl) is added to a 100.0 mL solution at room temperature and given suf...

A:                                                   AgI (s)  ⇔  Ag+  +   I-                           ...

Q: 1.00 g of a certain Compound X, known to be made of carbon, hydrogen and perhaps oxygen, and to have...

A:

Q: An analytical chemist is titrating 166.9 ml. of a 0.8700 M solution of dimethylamine ((CH) NH) with ...

A:   Acid-base reaction                          (CH3)2NH                  +                     HNO3  ...

Q: A gas is allowed to expand, at constant temperature, from a volume of 1.0 L to 10.1 L against an ext...

A:

Q: Gaseous methane (CH,) will react with gaseous oxygen (0,) to produce gaseous carbon dioxide (CO,) an...

A: Mass of methane= .12 g, molar mass= 16 g mol-1 mass of O2=27.6 g, molar mass= 32 g mol-1 mass of met...

Q: A bicyclist is stopped at the entrance to a valley, as sketched below: E Where would the bicyclist h...

A: A bicyclist is stopped at a entrance to a valley we have to determine P.E , K.E , T.E

Q: If you calculated the molar mass of your unknown liquid to be 70.1 g/mol, which of the following do ...

A: Given-> Calculated molar mass of unknown liquid =70.1 gm/mole.    

Q: the use of an indicator to determine a concentration using titration as good as using a pH meter?  W...

A: Principle of pH meter  - it is scientific  instruments  which measure  hydrogen  ion activity  in so...

Q: identify the central atom(s) for HCCI3. CI H C   * it is a check mark box type of question

A: The central atom is usually the atom with the lowest subscript in the molecular formula and the atom...

Q: en the thermochemical equation 2S02(g) + O2(g) – 2SO3(g), AH°rxn-198 kJ/mol, how much heat is evolod...

A: Answer and explanation is given below hope you like it.

Q: 12.48 Describe how you would use freezing-point depression and osmotic pressure measurements to dete...

A: Colligative properties : These are the properties of any solution , which depends upon the concentra...

Q: A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains 2....

A:

Q: You are given the two following reactions below. You must compare them and circle the one that is fa...

A: The functional group is a key constituent that furnishes the characteristic chemical reactions to th...

Q: The decomposition of XY is second order in XY and has a rate constant of 7.00×10−3 L mol−1 s−1 at a ...

A:

Q: Please answer all (2)

A: True and False.,    

Acid Base Titration

An acid-base titration is the method of quantitative analysis for determining the concentration of an acid and base by exactly neutralizing it with a standard solution of base or acid having known concentration.