Reference no: EM13181947
A.) To keep ionic strength constant and maintain a more consistent matrix in a solution where ions could be influencing each other, another component is often added to the solution. This is an ionic compound, not involved directly with the reaction, called an ionic strength adjuster (ISA) ingredient. What is the ionic strength (I) of a solution that contains 0.0280 M (NH_4)_2_SO_4 as the ISA ingredient?
(NH_4)_2_SO_4(s) --> 2NH_4^+^(aq) + SO_4^2-^(aq)
B.) One particular use of a selective electrode is the determination of the level of Cl^-^ in drinking water. What would be the activity coefficient (%u03B3) for the chloride ion Cl^-^ in the solution from part "A"?
C.) The chemical activity (a) of an ion in the solution is related to the actual concentration of the ion. Which one, if any, of the following statements is actually true?
(i.) The chemical activity of an ion is closest to the actual concentration when the ion concentration is very high.
(ii.) Chemical activity and the activity coefficient are two names that have the same meaning.
(iii.) A substance in its standard state will have a chemical activity of 0.
(iv.) In a solution with high ionic strength in the background, Cl^-^ ions will have less repulsion for each other.
(v.) Actually, none of this is true.
|
Calculate the cross elasticity of demand
: During the past year, the average price of lots along Lake Michigan in Carol Beach rose from $2,500 to $3,000 per foot of lake front. At the same time, sales of new homes located off the Lake rose from 40 to 70 units. Calculate the cross elastici..
|
|
Explain and draw the structure of a compound
: Draw the structure of a compound with the following analytical data: a mw of 72 g/mol, no silver mirror in a Tollen's test, and a yellow precipiate formed in an iodoform test.
|
|
Find out the empirical formula and draw a possible structure
: Determine the empirical formula and draw a possible structure for an organic compound with the elemental composition
|
|
What level would price have to be lowered
: Calculate the implied arc income elasticity of demand. I =? Given a price elasticity coefficient of -2.5, to what level would price have to be lowered to maintain there sales at a level of 28 million square yards. New Price =?
|
|
State maintain a more consistent matrix in a solution
: To keep ionic strength constant and maintain a more consistent matrix in a solution where ions could be influencing each other, another component is often added to the solution
|
|
Explain what is the volume of the air in the balloon
: ideal gas on a cool morning (11*C). The air is heated to 103*C. What is the volume of the air in the balloon after it is heated?
|
|
Calculate price elasticity of demand for tlc service
: TLC Lawn Care, Inc. provides fertilizer and weed control services to residential customers. Its seasonal services package, regularly priced at $250, includes several chemical spray treatments. As part of an effort to expand its customer base, TLC..
|
|
Explain what mass of ethanol is present in the vapor
: What mass of ethanol is present in the vapor? (the vapor pressure of ethanol is 10.0 torr at -2.3 degrees C and 40.0 torr at 19 degrees
|
|
State hydrogen peroxide decomposes into water
: Hydrogen peroxide decomposes into water and oxygen in a first order process. At 20 degrees C, the half life for the reaction is 3.92 x 10^4 seconds
|