To clean the impeller blades of a stainless steel tank, plant Figure Map technic

Question

To clean the impeller blades of a stainless steel tank, plant Figure Map technicians pour 290.0 Lof a260.0 g HNOyL solution in a 820.0-L tank to soak. When the tank needed to be emptied, the tank was first filled with water entering at a rate of 2.10 Us. 2.10 LH20/s (Figure 1) Att the tank is completely full of solution. At this point water continued to enter the tank at the same rate, but solution was also drained from the bottom of the tank at 2.10 Us (Figure 2). Make the assumption that the fuid density does not change and answer the following questions. Which sketch below best represents the concentration of HNO3 within the tank as a function of time? (L), C (gM) Figure 2 v 2.10 LHzols (concentrations linear before and after t) V (L), C (g/L) 2.10 Us C (gA)

Explanation / Answer

1.

C

Concave up before tF and linear after tF.

2.

tF =

Total volume is 820 L and we have added 290 L

Remaining L to be added = 530 L.

We are adding 2.1 L/s

tF = 530/2.1 = 252.38 s

3.

Ci x Vi = Cf x Vf

260 * 290 = Cf * 820

Cf = 91.95 g HNO3/L

4.

0.01 of initial concentration is 2.6 g HNO3/L

tF * Cf = t0.01 * C0.01

252.38 * 91.95 = t0.01 * 2.6

t 0.01 = 8925.51 s

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