assume an activity coefficient of 1 for all substances and no effect of ionic strength. eliminate terms in quadratic solutions for [h_{+}] only if the weak acid is dissociated < 5%

a. in a hospital laboratory, a 10.0 ml sample of gastric juice obtained several hours after a meal was titrated with 0.1 m naoh to neutrality; 7.2 ml of naoh was required. the patient's stomach contained no indigested food or drinks, thus assume no buffers were present. what is the ph of the gastric juice?

b. lactic acid is produced and builds up in muscles during intense exercises and causes painful, sore muscles. what is the ph of 0.6 mm lactic acid, pka = 3.86.

c. what is the ph of a mixture of equal volumes of 0.6 mm hcl and 0.4 mm naoh?

d. what is the ph of a mixture of equal volumes of 0.6 mm lactic acid and 0.4 mm naoh?

e. if the concentrations of hcl and naoh are tripled in part c, by what factor will the ph be changed?

f. if the concentrations of lactic acid and naoh are tripled in part d, by what factor the ph be changed?

g. what is the rationale for the observed differences in ph as a function of increasing hcl and lactic acid concentrations?

Imagine that you’re getting ready to move to a new city. when people move, they are influenced by push factors and pull factors, and you have many reasons for your move. which of the following factors is an example of a pull factor? a. wanting to move because you’ve found a great new school somewhere new b. needing to move because there are not enough resources in your old hometown c. being forced to move because your old home is gone d. having to move because there are no jobs in your current hometown

Nanotechnology, the field of trying to build ultrasmall structures one atom at a time, has progressed in recent years. one potential application of nanotechnology is the construction of artificial cells. the simplest cells would probably mimic red blood cells, the body's oxygen transporters. for example, nanocontainers, perhaps constructed of carbon, could be pumped full of oxygen and injected into a person's bloodstream. if the person needed additional oxygen-due to a heart attack perhaps, or for the purpose of space travel-these containers could slowly release oxygen into the blood, allowing tissues that would otherwise die to remain alive. suppose that the nanocontainers were cubic and had an edge length of 24 nanometers. part a part complete what is the volume of one nanocontainer? (ignore the thickness of the nanocontainer's wall.) express your answer using two significant figures. v v = 1.4ă—10â’20 l previous answers correct significant figures feedback: your answer 1.3824â‹…10â’20 = 1.382ă—10â’20 l was either rounded differently or used a different number of significant figures than required for this part. if you need this result for any later calculation in this item, keep all the digits and round as the final step before submitting your answer. part b suppose that each nanocontainer could contain pure oxygen pressurized to a density of 81 g/l . how many grams of oxygen could be contained by each nanocontainer?

What must occur for air masses to form fronts