Test-exam 2

Basic aqueous solution half reaction ocl h2ol 2 e cl

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Unformatted text preview: 89 -2.92 -2.92 -2.93 -2.93 -3.05 E°, volts +0.89 +0.87 +0.60 -0.06 17 Some useful equations average or mean x x i 1 N i N median = middle value mode = most frequently occurred value range = xmax xmin deviation xi x (x x ) i 1 i N average deviation N s (x x ) i 1 i N 2 sample standard deviation Absolute uncertainty = s N 1 RSD s x RSD 100% relative standard deviation = relative uncertainty = percent relative standard deviation = coefficient of variance = CV relative standard deviation in ppt RSD 1000 Propagation of error: Let a represents the experimental variables and addition – If e the associated error or uncertainty: a1 e1 a2 e2 a3 e3 a4 e4 (a1 a2 a3 a4 ) then the result should be reported as e i 1 4 2 i subtraction – If a1 e1 a2 e2 a3 e3 a4 e4 (a1 a2 a3 a4 ) then the result should be reported as e i 1 4 2 i multiplication & division – 18 If a1 e1 a2 e2 a3 e3 a4 e4 a1 a2 a1 a2 a3 a4 a3 a4 ei a i 1 i 4 2 then the result should be reported as Exponent – If y ax e ax ax x a a then the result should be reported as Logarithm – If y log10 a e y log10 a 0.434 a a then the result should be reported as Antilogarithm – If y anti log10 a then the result should be reported as anti log10 a anti log10 a 2.303 ea Linear Regression Analysis y mx b : S xy ( xi x )( yi y ) sum of deviation square of xy slope S xx intercept b y mx , “=intercept(y vs. x cells)” deviation from regression line = standard error m S xy , “=slope(y vs. x cells)” Sr S yy m 2 S xx...
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