Chapter 2, Problem 9RQ

If the addition of an acid or a base to a solution does not change its pH (or changed minimally), then that solution is referred to as a a. acid b. base c. buffer d. neutral solution

Glucose dissolves in the water of blood plasma. This mixture is best known as a(n): a. solution. b. suspension. c. aerosol. d. colloid.

Which of the following liquid substances exhibit the highest viscosity at 25 ºC? A.    H3C−(CH2)4−CH2OH  (hexanol) B.    H3C−(CH2)3−CH2OH  (pentanol) C.    H3C−(CH2)4−COOH  (hexanoic acid) D.    All of the above have equal viscosities.

1. We have a 10% NaCl stock solution. Our nutrient solution is 3 mM for NaCl. How many ml of stock solution do we need for 500 ml of our solution nutrients? (MNaCl:58.49) 2. We work with a NaOH stock solution. We have to dilute 1: 4 to obtain a 2.5% solution. Find the concentration of the stock (% and mg/ml)

Substances those are partially dissolved in water are commonly known as اخترأحد الخيارات a. hydrophilic / hydrophobic b. false statement c. hydrophilic d. hydrophobic e. all given choices are incorrect

Which of the following describes a buffer?   A. The measure of the amount of hydrogen ions in a liquid   B. A set of chemicals that can keep the pH of a solution stable by alternately donating and accepting the ions that contribute to pH   C. A substance that releases hydrogen ions in water   D. A substance that accepts hydrogen ions in water

(8). Na2EDTA is actually used in the lab because ____   a.  it does not lose its crystalline water component. it loses its crystalline water component thus makes a constant composition. it is a base which is needed to react with metal ions. it is easier to be dissolved in water than EDTA. it is only commercially available EDTA-related reagent.      (9). Which of the following statement is true  ? ____    a.  EDTA is an amino acid.    Usually we use the acidic form of EDTA for the lab use. EDTA stands for “ Ethyldimertetraacid” EDTA forms complexes with metal ions in a variable stoichiometry. EDTA usually offers 5 binding sites for metal ions. None of the above   (10).  “The determination of CuO ore sample” lab is a ____     a. Acid-base titration        b. complexometric titration         c. iodometry          d. gravimetry           e. iodimetry

Which of the following substances will dissolve in water A.nonpolar B.polar C.hydrophobic D.hydrophilic E.ionic

Can you explain the various options and how did you come to the answer? How to determine when something is a weak acid? Or strong acid or base?