Chemistry

Chemistry, 08.08.2019 04:30, carsonbake

Using a 0.30 m phosphate buffer with a ph of 7.0, you add 0.80 ml of 0.47 m hcl to 50. ml of the buffer. what is the new ph of the solution?

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Chemistry, 19.07.2019 09:00, Savagepanda911

Say, for example, that you had prepared a buffer c, in which you mixed 8.203 g of sodium acetate, nac2h3o2, with 100.0 ml of 1.0 m acetic acid. what would be the initial ph of buffer c? if you add 5.0 ml of 0.5 m naoh solution to 20.0 ml each of buffer b and buffer c, which buffer's ph would change less? explain

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Chemistry, 27.07.2019 03:20, fernandez122115

Abuffer is made up of 350 ml each of 0.20 m hf and 0.14 m naf. assuming that volumes are additive, calculate a) the ph of the buffer solution. b) the ph of the buffer after the addition of 0.030 mol of koh to the above buffer c determine the number of moles of hci would have to be added to the buffer (in a) to make the ph decreases by 1.50 ph unit. is this solution still an effective buffer? briefly explain in terms of buffer capacity

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Chemistry, 23.10.2019 01:10, xxxamslashxxx9

2. buffer capacity refers to the amount of acid or base a buffer can “absorb” without a significant ph change. it is governed by the concentrations of the conjugate acid and base forms of the buffer. a 0.5 m buffer will require five times as much acid or base as a 0.1 m buffer for given ph change. in this problem you begin with a buffer of known ph and concentration and calculate the new ph after a particular quantity of acid or base is added. in the laboratory you will carry out some stepwise additions of acid or base and measure the resulting ph values. starting with 60 ml of 0.50 m phosphate buffer, ph=6.83, you add 1.7 ml of 1.00 m hcl. using the henderson-hasselbalch equation with pk2 for phosphate of 6.64 calculate the following values to complete the ice table. what is the composition of the buffer to begin with, both in terms of the concentration and the molar quantity of the two major phosphate species? (units required.) what is the molar quantity of h3o+ added as hcl, and final molar quantity of hpo and h2po4- at equilibrium? what is the new hpo42-/h2po4- ratio, and the new ph of the solution? (note: you can use the molar ratio rather than the concentration ratio because both species are in the same volume.) now take another 60 ml of the 0.50 m ph 6.83 buffer and add 3.7 ml of 1.00 m naoh. using steps similar to those above, calculate the new ph of the solution.

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Using a 0.30 m phosphate buffer with a ph of 7.0, you add 0.80 ml of 0.47 m hcl to 50. ml of the buf...

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