i am doing a science experiment and was wondering how long it would take to ferment orange juice if we changed the ph to a higher or lower level than the ph of the orange juice ( about 3-4 on the scale )How long does it take orange juice to ferment if you change the ph?
guess it would depend how much you change the PH and what you use to ferment it.
Saturday, November 20, 2010
How do I change the PH of my skin?
My Ph of my skin is very acidic and causes me to rust through strings on my guitar very fast, and I want to know besides constantly washing my hands what I can do to stop that. So if there's any way to raise my skin PH to a less acidic state that would be very beneficialHow do I change the PH of my skin?
Washing in PH neutral bath washes such as Pinetarsol or using Detol hand washes balances the PH however it wont be your skin that has a high acidic PH more than likely it is the things you touch or sweat.blonde hair games
Washing in PH neutral bath washes such as Pinetarsol or using Detol hand washes balances the PH however it wont be your skin that has a high acidic PH more than likely it is the things you touch or sweat.
Calculate the pH change when of 1 mL of 0.2 M HCl is added to 50 mL of deionized water.?
Calculate the pH change when of 1 mL of 0.2 M HCl is added to 50 mL of deionized water.
How does this pH value change compare to those obtained when 1 mL of 0.2 M HCl is added
to the buffers?Calculate the pH change when of 1 mL of 0.2 M HCl is added to 50 mL of deionized water.?
mol of H+ added = 1 ml * 0.2 mol / L = 0.2 mmol H+.
[H+] = 0.2 mmol / (51 ml) = 3.92 * 10 ^-3
pH = -log(3.92 * 10 ^-3) = 2.40
pH change = 7.00 - 2.40 = 4.6
if the acid is added to the buffer, it won't make a big change in pH.
How does this pH value change compare to those obtained when 1 mL of 0.2 M HCl is added
to the buffers?Calculate the pH change when of 1 mL of 0.2 M HCl is added to 50 mL of deionized water.?
mol of H+ added = 1 ml * 0.2 mol / L = 0.2 mmol H+.
[H+] = 0.2 mmol / (51 ml) = 3.92 * 10 ^-3
pH = -log(3.92 * 10 ^-3) = 2.40
pH change = 7.00 - 2.40 = 4.6
if the acid is added to the buffer, it won't make a big change in pH.
A student adds 8.70mL of a 0.420M HCl solution to the beaker. How much will the pH change?
A beaker with 190mL of an acetic acid buffer with a pH of 5.00 is sitting on a benchtop. The total molarity of acid and conjugate base in this buffer is 0.1M . A student adds 8.70mL of a 0.420M HCl solution to the beaker. How much will the pH change? The pKa of acetic acid is 4.76.
Express your answer numerically. Use a minus (-) sign if the pH has decreased.A student adds 8.70mL of a 0.420M HCl solution to the beaker. How much will the pH change?
the pH will decrease since you add an acid
you have the formula
pH =pKa + log [base]/[acid ] [ ]=concentration
5=4.76+log[base]/[acid ]
log[base]/[acid ] =0.24
so [base]/[acid ] =1.738 and [base]=1.738[acid]
and the molarity of the acid is 0.1= 2.738[acid]
[acid]= 0.1/2.738=0.0365
concentration of base being .1-0.0365 =0.0635M
the number of moles of acid is 0.19*0.0365=0.006935M
you add to this 8.7mL= 0.0087L of 0.42m HCL =0.003654 mole of acid
and the mole of acid= 0.006935+0.003654= 0.007308
so the pH is pH =4.76+ log0.00635/0.007308 =4.76-0.06=4.7
final answer 4.7
the pH has dropped -0.3 unit
Express your answer numerically. Use a minus (-) sign if the pH has decreased.A student adds 8.70mL of a 0.420M HCl solution to the beaker. How much will the pH change?
the pH will decrease since you add an acid
you have the formula
pH =pKa + log [base]/[acid ] [ ]=concentration
5=4.76+log[base]/[acid ]
log[base]/[acid ] =0.24
so [base]/[acid ] =1.738 and [base]=1.738[acid]
and the molarity of the acid is 0.1= 2.738[acid]
[acid]= 0.1/2.738=0.0365
concentration of base being .1-0.0365 =0.0635M
the number of moles of acid is 0.19*0.0365=0.006935M
you add to this 8.7mL= 0.0087L of 0.42m HCL =0.003654 mole of acid
and the mole of acid= 0.006935+0.003654= 0.007308
so the pH is pH =4.76+ log0.00635/0.007308 =4.76-0.06=4.7
final answer 4.7
the pH has dropped -0.3 unit
What is the pH change observed on adding 0.010 mol HCl to 1.00L of 0.10 M C6H5CO2H (Ka=6.5 X 10^-5)?
I'm not sure how to find the final pH.What is the pH change observed on adding 0.010 mol HCl to 1.00L of 0.10 M C6H5CO2H (Ka=6.5 X 10^-5)?
1.
[H+] = square root (Ka*Ca) = 2.55*10^-3 M
pH = 2.59
2.
pH = - log Ca = 2.00
螖pH = 2.00 - 2.59 = - 0.59
1.
[H+] = square root (Ka*Ca) = 2.55*10^-3 M
pH = 2.59
2.
pH = - log Ca = 2.00
螖pH = 2.00 - 2.59 = - 0.59
Would 2 small Lava rocks change the PH in my 65 gallon fresh water tank?
I know that lava rocks raises the PH in tanks, but I'm curious to know how much of the rock you need to actually get the PH up in a 65 gallon tank.Would 2 small Lava rocks change the PH in my 65 gallon fresh water tank?
If you need to increase your pH slightly try adding some crushed coral substrate to your filter. It will slowly buffer it. Keep in mind a stable pH is ALWAYS better than a pH that is constantly changing because you're trying to keep it at an ';ideal'; number.Would 2 small Lava rocks change the PH in my 65 gallon fresh water tank?
A lot, like 10 pounds for a small chance.
All lava rock is not the same. Most Lava rock does not increase the ph in your tank. Lava rock is an inert rock. Pumice is PH neutral and will do nothing for your tank.
Thre is hawaii lava rock, colorado lava rock, Australian rock Most lava rocks will not raise the ph that much if at all. Try going with sea shells hidden in the filter.
PH should really not be played with unless there is truly a problem. Just because a fish prefers 7.0 doesn't mean they don't do fine in a 6.5 or 7.5 they are very flexable. Driftwoods and peats lower the ph while sea shells, limestone etc. raise it naturally. Try adding sea shells one at a time let the water go for a day test if you feel you need to raise it more add another shell.
If you need to increase your pH slightly try adding some crushed coral substrate to your filter. It will slowly buffer it. Keep in mind a stable pH is ALWAYS better than a pH that is constantly changing because you're trying to keep it at an ';ideal'; number.Would 2 small Lava rocks change the PH in my 65 gallon fresh water tank?
A lot, like 10 pounds for a small chance.
All lava rock is not the same. Most Lava rock does not increase the ph in your tank. Lava rock is an inert rock. Pumice is PH neutral and will do nothing for your tank.
Thre is hawaii lava rock, colorado lava rock, Australian rock Most lava rocks will not raise the ph that much if at all. Try going with sea shells hidden in the filter.
PH should really not be played with unless there is truly a problem. Just because a fish prefers 7.0 doesn't mean they don't do fine in a 6.5 or 7.5 they are very flexable. Driftwoods and peats lower the ph while sea shells, limestone etc. raise it naturally. Try adding sea shells one at a time let the water go for a day test if you feel you need to raise it more add another shell.
Explain how the relationship between co2 in the atmosphere and CO2 in the surface ocean has changed pH.?
I'm not a hundred percent sure but i was thinking that it had to deal with that an increase in CO2, due to the formula Co2 + H2O %26lt;-%26gt; H2CO3 would cause the ocean to become more acidic. but I dont know if that answer is clear enough or worded right. plz help!Explain how the relationship between co2 in the atmosphere and CO2 in the surface ocean has changed pH.?
That's pretty much it. As atomspheric Co2 content increases, more forms in the ocean to make carbonic acid and lower pHExplain how the relationship between co2 in the atmosphere and CO2 in the surface ocean has changed pH.?
Yes, the formation of carbonic acid is the cause of acidification. I would add the first dissociation step as part of the argument (H2CO3 = H+ + HCO3-), because the stable form at near neutral pH is bicarbonate; that is, it is this dissociation that causes pH to decrease under natural conditions, in ocean waters.shutting down computer primer for combination skin
That's pretty much it. As atomspheric Co2 content increases, more forms in the ocean to make carbonic acid and lower pHExplain how the relationship between co2 in the atmosphere and CO2 in the surface ocean has changed pH.?
Yes, the formation of carbonic acid is the cause of acidification. I would add the first dissociation step as part of the argument (H2CO3 = H+ + HCO3-), because the stable form at near neutral pH is bicarbonate; that is, it is this dissociation that causes pH to decrease under natural conditions, in ocean waters.
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