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If the pH of a bicarbonate-carbonic acid buffer is 7.90. Compute the ratio of the concentration of carbonic acid (H2CO3) to that of the bicarbonate ion (HCO3-).
How many moles of HF (ka= 6.8 X 10^-4) must be present in 0.200L to form a solution with a pH of 3.25
Identify the incorrect names or formulas.
An element has a half life of I month. Given 1000 radioactive atoms, how many radioactive elements will remain after 3 months?
A student followed the procedure of this experiment to determine the Caloric content of a Planter's cocktail peanut. The peanut studied had a mass of 0.609 g before combustion and 0.053 g after combustion
a the following surface tension were measured for aqueous solutions of the nonionic surfactantch3ch29och2ch25oh at
determine the empirical formula of a compound having the following percent composition by mass k
question 1. if 0.015 m nacl shows conductivity of 12000 unites based on total ion concentration what conductivity
A mixture of 0.156 moles of C is reacted with 0.117 moles of O2 in a sealed 10.0L vessel at 500.K, producing a mixture of CO and CO2. The total pressure is 0.640 atm. What is the partial pressure of CO
What are the equilibrium concentrations of NO-2 , HNO2, H+, and OH- in an aqueous solution prepared by combining 50.0 mL of 0.0500 M NaNO2 and 50.0 mL of 0.0800 M HCl? Ka = 7.2 x 10-4 for HNO2.
The molecular shape of [TeF3 ]-1 is: A. tetrahedral B. square planar C. square pyramidal D. trigonal bipyramidal E.octahedral F. T-shaped G. see-saw, butterfly, or unsymmetrical tetrahedron
How many grams of O2 are contained in a 25.0 L sample at 5.20 atm and 28.0°C? 2. How many moles of gas are present in a 10.0 liter sample at STP? 3. How many grams are in 10.0 mEq of Ca2+?
Suppose that there are 2.43 moles of nitrogen gas, N2, in an insulated, sealed 31.7 L contianer at initial temp 285 K. Specific heat is 1.04 kJ/kgK. If a 5.44 block of iron at 755K is placed in container and sealed again, (with no loss of hydrogen..
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