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Cyanide solutions used for heap leaching are made up of sodium cyanide (NaCN). The sodium cyanide solution ([NaCN]-total = 0.01 M) is kept at pH 10.4. The pH is kept high to keep the cyanide in the CN- form. If CN protonates by the reverse of the HCN dissociation reaction,HCN = H+ + CN- pKa = 9.24and forms HCN, it will volatilize, and if it volatilizes, HCN can poison mine workers. At pH 10.4, what fraction of the cyanide is in the CN- form?Calculate the fraction as [CN-] / [NaCN]-total.
A driver is traveling 68 mi/h on a road with a -3% grade. There is a stalled car on the road 1000 ft ahead of the driver. The driver's vehicle has a braking efficiency of 90% and anti-lock brakes.
An obstruction is lodged in a 10-ft wide rectangular channel (n = 0.022) that has a botom slope of 0.005. The depth of the channel just upstream of the obstruction is 5.0 ft. If the flow rate is 325 cfs, what is the channel and flow classification
A confined aquifer has a specific storage of 2.5 * 10^-6 /m . The porosity is .20 and the water compressibility is 5 * 10-10/Pa.For the aquifer skeleton compressibility you just calculated, what would the aquifer specific storage be if porosity were ..
What kind of soil labs are good for the construction which is underlying the wet clay is dense sand. For example, compaction, and so on.
Evaluate company performance in relation to GRI standards and comment on Stigler's theory.
The back tangent gradient is -4 percent, the forward tangent gradient is 2 percent, and the elevation of the curve at station 48+50 must equal to at least 510ft. What is the required length of the curve?
The probability density function, f(t), of the time in hours between storms during the summer in Miami is estimated as f(t) = .014e^(-.014t) if x > 0, f(t) = 0 if x is less than or equal to 0 where t is the time interval between storms in hours.
A rear-wheel-drive 3000lb drag race car has a 200-inch wheel base and a center of gravity 20 inches above the pavement and 140 inches behind the front axle. The owners wish to achieve an initial acceleration from rest of 15 ft/s on a level paved s..
When Eurasia restaurant, serving Eurasian cuisine, first opened along Chicago's Michigan Avenue, its novelty brought many diners.
At what depth will 400 cfs flow uniformly in an earth lined (n = 0.025) trapezoidal canal of base width 15 ft having side slopes 1 on 3 if the canal is laid on a slope of 1 in 10,000.
Collar A is dropped 30 inches onto collar B, which is resting on a spring of constant k= 4 lb/in. Assuming perfectly plastic impact (coefficient of restitution e=0), determine the maximum deflection of collar B.
You have a standard card deck of 52 cards. Select one card, find P[heart/ace]. B.) You have a deck of 51 cards, which happens to be missing the eight of diamonds, Find P(heart/ace). C.) In the situation above find P (spades/8).
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