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From Wikipedia

Concentration

In chemistry, concentration is the measure of how much of a given substance there is mixed with another substance. This can apply to any sort of chemical mixture, but most frequently the concept is limited to homogeneous solution s, where it refers to the amount of solute in the solvent.

Concentric

Concentricobjects share the same center, axis or origin with one inside the other. Circles, tubes, cylindrical shafts, disks, and spheres may be concentric to one another. Concentric objects generally have different radii, as concentric objects with the same radius are equal.

One of the most familiar examples of concentric circles are the evenly spaced circles of a target used in target archery or firearms, and accordingly any concentric design may be called a "target" or a "bullseye" (after the center).

Examples of concentric phenomena

Concentriccable is a cable type used in TN-C-Searthing systems where the combined neutral and earth core completely surrounds the live core(s). This minimizes the risk of completely cutting through the combined neutral and earth without first completely cutting through the live cores.

Concentric muscles contractions are those in which the muscle shortens.



From Yahoo Answers

Question:what is the percent by mass of acetic acid in your unknown?Assume the density of the solution is 1.00 g/mL and the molecular weight of acetic acid is 60 g/mol]

Answers:9.9%

Question:Please help. What is the concentration of 50.0 mL of NaOH solution that is neutralized by 30.0 mL of a .500M HCl?

Answers:balanced equation: NaOH + HCl --> NaCl + H2O formula: (coefficient of base)(molarity of acid)(volume of acid) = (coefficient of acid)(molarity of base)(volume of base) plug givens into formula: 1(.500 M)(30.0 mL) = 1(x M)(50.0 mL) x = .300 M NaOH

Question:What is the concentration of an acid solution if 35.56 mL of .1122 M barium hydroxide are needed in a titration to neutralize 25 mL of the acid?

Answers:m1v1=m2v2 (35.56 x .1122)/ 25 =0.1596 M

Question:We measure the acidity of a solution by measuring the concentration of hydronium ions. What does it mean to say one has a neutral solution? a. the concentration of hydronium ions equals the concentration of hydroxide ions b. the concentration of hydronium ions is higher than the hydroxide ions c. there are many more hydroxide ions in this solution than hydronium d. the pH is about 0

Answers:correct answer is letter 'a.' example for water Kw = [H3O+][OH-] = 1 x 10^-14 pH = 7 for neutrality when the hydronium and hydroxide concentrations are equal (1 x 10^-7 each)

From Youtube

Concentration :the concentration of a solution is based on the relative amount of solute to solvent

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