Friday

December 19, 2014

December 19, 2014

Total # Posts: 7

**Chemistry**

NH3 is a weak base (Kb = 1.8 × 10–5) and so the salt NH4Cl acts as a weak acid. What is the pH of a solution that is 0.050 M in NH4Cl?
*March 9, 2013*

**Chemistry**

If the pH of a solution is 6, what are the hydrogen- and hydroxide-ion concentrations? The PH of a 0.1 M MCl (M+ is an unknown cation) was found to be 4.7. Write the net ionic equation for the hydrolysis of M+ and its corresponding equilibrium expression Kb. Calculate the ...
*February 19, 2013*

**Chemistry**

got it!! the answer is 0.6 and it was correct!! Thank you so so much!!
*February 17, 2013*

**Chemistry**

At equilibrium, the concentrations in this system were found to be [N2]=[O2]=0.100 M and [NO]=0.400 M. N2 (g) + O2 (g) --> 2NO (g) If more NO is added, bringing its concentration to 0.700 M, what will the final concentration of NO be after equilibrium is re-established?
*February 17, 2013*

**math**

In 1980, the population of a certain country was about 161 000. since then the population has decreased about 1% per year. a. find an equation to model the population since 1980 b. estimate the population in 1990 c. suppose the current trend continues. predict the population ...
*November 16, 2011*

**problem of the week**

Imagine one large cube made of 1000 white centimeter cubes. Suppose the outside of the large cube was painted black. How many of the small white cubes would have the following? 1) 0 faces painted black 2) 1 face painted black 3) 2 faces painted black 4) 3 faces painted black
*October 10, 2011*

**CHEM 136**

A sample of 25.00 mL of 0.100 M HNO2(in a flask) is titrated with 0.150 M of NaOH solution at 25 degrees. 1) calculate the volume(Ve) of the NaOH solution needed to completely neutralize the acid in the flask. 2)calculate the pH for (a)the initial acid solution in the flask (b...
*November 23, 2010*

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