# Recent content by apchemstudent

1. ### Buffer Capacity

oops... i think i got the answer... thanks
2. ### Buffer Capacity

What is the smallest amount of solid NaOH that will exceed the buffer capacity 500mL of a buffer that is 0.4M in acetic acid and 0.15M in NaOAc? a)5.69 b)5.16 c) 4.74 d) 4.31 e)3.00 grams Since this is a strong base, we only need to deal with the 0.4M of acetic acid. so 0.4M *.5L =...
3. ### Partial Pressure Equilibrium lab

The problem is, if you try using your way, it will be very difficult to figure the answer out. I used a different method, and I got the answer. Thanks anyways.
4. ### Partial Pressure Equilibrium lab

Pure solid ammonium carbamate, NH4CO2NH2, is allowed to dissociate into a vacuum according to the equation: NH4CO2NH2(s) ---> 2 NH3(g) + CO2(g) At 25oC, the total pressure of the gases in equilibrium with the solid is 0.116 atm. If carbon dioxide, CO2, was then added, sufficient to have...
5. ### Joined Spring problem

they are on the same side
6. ### Limit problem

I take it as, there's no solution to this problem. Either I'm reading the question wrong, or the prof wrote the question wrong. This is because for any other problems in this exercise, the limit did exist, so I'm sceptical as to whether the answer is infinity.
7. ### Oscillation of object on spring - Find speed

A massless spring hangs from the ceiling with a small object attached to its lower end. the object is initially held at rest in a position y such that the spring is at its rest length(not stretched). The object is then released from y and oscillates up and down, with its lowest position being 10...
8. ### Joined Spring problem

So Equivalent spring is = (1/k1 + 1/k2 + 1/k3.... 1/kn)^-1 where kn is the spring constant for each component ? This is based on what you said. This is how I would approach it: Let's say there are only 2 springs connected in series. We can calculate the ratio between the distances...
9. ### Limit problem

How do you find the limit to: Lim x->0+ sqrtx/(1-cosx) I use the L'Hopital rule and i get lim x->0+ 1/(2sqrtx*sinx) and I can't get anywhere after this. I even tried multiplying by sqrtx/sqrtx to get rid of the sqrtx at the beginning, but it still doesn't work. Please help, thanks.
10. ### Joined Spring problem

Two springs with a spring constant of k = 6430 N/m are joined and connected to a block of mass 0.245 kg. The system is then set oscillating over a frictionless surface. What is the frequency of the oscillations? This is what I think is the correct approach to this question: since the...
11. ### Limit problem

How do you find the limit to: Lim x->0+ sqrtx/(1-cosx) I use the L'Hopital rule and i get lim x->0+ 1/(2sqrtx*sinx) and I can't get anywhere after this. I even tried multiplying by sqrtx/sqrtx to get rid of the sqrtx at the beginning, but it still doesn't work. Please...
12. ### Oscillating spring problem

A massless spring hangs from the ceiling with a small object attached to its lower end. the object is initially held at rest in a position y such that the spring is at its rest length(not stretched). The object is then released from y and oscillates up and down, with its lowest position being 10...
13. ### Joined Springs

they are in series As well, how would some one solve a problem like this, if the springs were not identical?
14. ### Joined Springs

Two springs with a spring constant of k = 6430 N/m are joined and connected to a block of mass 0.245 kg. The system is then set oscillating over a frictionless surface. What is the frequency of the oscillations? This is what I think is the correct approach to this question: since the...
15. ### Hexyl ethanoate or octanoic acid?

Which is more soluble in hexane, hexyl ethanoate or octanoic acid? I'm thinking it's octanoic acid with the longer uninterrupted hydrocarbon chain, where as the ester's longest uninterrupted hydrocarbon chain is composed of six carbons. Is this correct? If not can you please explain why? Thanks.