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Require to prepare 100.0 mL of a pH=4.00 buffer solution using 0.100 M benzoic acid (pKa = 4.20) and 0.200 M sodium benzoate. Explain how much benzoic acid and sodium benzoate must be mixed to prepare this buffer?
the mass of the flask is measured when the outside of the flask is wet. However in part B.3 the outside of the flask is dried before its mass is measured.
Consider a house into which radon is emitted through cracks in the basement. The total volume of the house is 650 m^3 (assume the volume is well mixed throughout). The radon source emits 250 pCi/s
a surface for which static coefficient of friction is 0.62. The ropes are massless. What is the Maximum mass of block A for which the system is in equilibrium?
in the electroysis of an aqueous solution agno3nbsp0.67gof agis deposited after a certain period of time. what is the
1. determine how many grams of o2 are present when mass of a sample of earths crust is of 328rm gg ? note down
How can you estimate the pH range of an indicator's color change. why do some indicators have two separate pH ranges.
Dehydrohalogenation of (2R, 3R)-2-bromo-3-methylpentane by a bimolecular reaction produces only (E)-3-methyl-2-pentene and 3-methyl-1-pentene as products. Provide a mechanistic explanation as to why (Z)-3-methyl-2-pentene is not formed.
The decomposition of N2O5 is a first-order reaction: N2O5 ? 2NO2 + ½ O2. At 25 °C, it takes 5.2 h for the concentration to drop from 0.120 M to 0.060 M. Calculate the rate constant for the decomposition of N2O5.
an ideal gas at 16.2 degc and a pressure of 2.56 x 105 pa occupies a volume of 2.56 m3. a how many moles of gas are
Calculate pH and the concentration of acetate ion resulting from the mixtureof 400ml of 0.1M formic acid and 100ml 0.1 sodium acetate.
If 25.0 mL of AgNO3 is needed to precipitate all the Cl- ions in a 0.795 mg sample of KCl(forming AgCl), what is the molarity of the AgNO3 solution.
determine what volume of .1 m hbr is required to neutralize 50 ml of .140 m barium hydroxide?considering the given
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