Questions asked by charles
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How to Calculate the pH of 0.180 g of potassium biphthalate (pKa = 5.4) in 50.0 mL of water?
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(1 point) A rock is thrown into a still pond and causes a circular ripple. If the radius of the ripple is increasing at a rate of 4 feet per second, how fast is the circumference changing when the radius is 20 feet?
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Why is it important that we know the initial concentration of NaOH very accurately and yet for crystal violet, we do not need to know its initial concentration? (We aren't using volumetric glassware when we add 3 drops of crystal violet)
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A well-known aphorism in chemistry is that for every 10° increase in temperature, the rate of a reaction will increase twofold. If the reaction were performed at 45° C predict whether it would occur at twice the rate of the reaction performed at 35° C ?
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Calculate the concentration (mol/L) of 25.5 mL of 7.07 mol/L HCl diluted to 0.500 L with water?
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Find the derivative of
f(x)=x2sinh−1(2x)?
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A buffer that contains 1.10 mol/L B and 0.700 mol/L BH+ has a pH of 9.65. What is the pH after 0.0045 mol of HCl is added to 0.500 L of this solution?
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Evaluate the indefinite integral:∫sqrt(10x−x^2)dx ?
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A hole of radius r is bored through the center of a sphere of radius R. find the volume of the remaining portion of the sphere?
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Find the length of the curve defined by #y=3ln((x/3)^2−1)# from x=7 to x=10?
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Find the length of the curve defined by
#y=18(4x^2−2ln(x)), x in[4,6]#?
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Compute this integral #int_(3^(1/2))^(35^(1/2))(x^2+1)^(1/2)/xdx#?
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Find the surface area of the solid of revolution obtained by rotating the curve
y=2x^3
from x=1 to x=6 about the x-axis?
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Find the surface area of the solid of revolution obtained by rotating the curve
x=(2y−y^2)^(1/2)
from y=8/16 to y=31/16 about the y-axis?
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Compute ∫y*(y^4+y^2+4)^(1/2)dy ?
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Find the surface area of the solid of revolution obtained by rotating the curve
y=4x^3
from x=1 to x=5 about the x-axis?