Calculate the Ka for an unknown monoprotic acid when a {M} M solution of the acid has pH #4 as given in the pH Values table at the bottom of this page. Answer format:  Enter in standard notation, not scientific with 2 sig figs.

At 25°C, the equilibrium constant Kc = 0.0012 for the reaction  B(aq) + C(aq)  ↔  2A(aq)     A solution of 0.80 M of B and 0.80 M of C is mixed and allowed to come to equilibrium. A student does the following steps below to calculate the equilibrium concentration of A.  There is one error in this calculation. Identify the step where the student made an error.

Which of the following types of immunity is provided by breast milk?

Use the Acid table of Ka values found at the bottom of the page for the monoprotic acids HA, HG, HQ and HX to determine which one has the strongest conjugate base?

Suppose 100 mL of {M} M HQ is being titrated with {M} M NaOH.  The Ka for HQ can be found in the Acids table at the bottom of this page.  What is the [OH-] when 130 mL of NaOH(aq) has been added? Answer format:  Enter the answer in standard, not scientific notation using 2 sig figs. 

Another name for resident microbes could be:

Which term is used to describe a disease outbreak that occurs more than expected in a given location and in a certain period of time?

What is a leukocidin?

Use reaction #4 from the Reactions table below to answer this question.  When the skeletal redox reaction, #4 is balanced in acidic solution, with smallest whole number coefficients, what is the coefficient in front of I-?  

For the two nuclear reactions below, fill in the blanks. Answer format:  Enter a number, followed by an element symbol, separated by a comma.  For example, “13, Fe”