26 Answered Questions for the topic Concentration

01/24/19

General Chemistry 2 concentration dilution problem

3. A 4.50 *10^-2 M solution is used to prepare a series of five 100.0 mL solutions of varying concentration for use in creating a calibration curve for a spectrophotometric experiment. Determine... more

06/13/18

Using mole ratio to determine concentration of a reactant?

S2O82- + 2 I- --> 2 SO42- + I2   (reaction 1)       [I-]=0.20M, [S2O82-]=0.10M      2 S2O32- + I2 --> S4O62- + 2 I-  (reaction 2)      [S2O32-]= 0.0050M   I need to determine the... more

06/07/18

What is the concentration of each gas once equilibrium is reached?

Can someone please let me know if I did this right?    1.800 mole of N2O4(g) is injected into a closed 1.00L container. Kc=4.66 x 10-3 at 298K   N2O4 (g) ⇌ 2NO2 (g)   what is the... more

05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?

If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 

04/03/18

You place 2.80 g of phosphoric acid (H3PO4) into 150.0ml of a 1.00M sodium hydroxide solution. If the total volume remains constant, determine the following

(Hint: this is an acid base reaction)   1. the concentration of sodium ion at the completion of the reaction____ 2. the concentration of phosphate ion at the completion of the reaction____ 3.... more

03/06/18

Do moles change with volume?

Does increasing or decreasing volume change the moles in a solution, or does that just affect the concentration?   If I have 0.035711 moles in 100mL and I'm asked how many moles in 5mL of this... more

03/01/18

Relative error to absolute error?

I'm asked to use the relative error to find the absolute error of [Na2S2O3]I've calculated these amounts in previous questions:[Na2S2O3] = 0.01001MRelative error: 0.3%is there other information I... more

02/25/18

Whats the correct way to approach this concentration question?

Part I. Preparation of a Fe(III)-oxalate complex: (4 pts) a) Recorded mass of Fe(NH4)2(SO4)2●6H2O used: 1.3807 (g) b) pH paper color upon addition of oxalic acid: Magenta c) Does this color... more

11/29/17

chemistry help

Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this

11/07/17

Changing Concentration

If 25 ml of creatinine (c4h7n3o) stock standard (conc= 1.0 g/dl) are diluted to 100ml to make an intermediate standard and then 15ml of the intermediate are diluted to 300ml to make a working... more

10/23/17

What will be the value of this concentration expressed in mol∙dm−3?

The concentration of H2SO4 in a certain solution is 1.23×10-2 mol∙cm-3

10/19/17

Question about Molarity. Please help me, Urgent.

How much water should be added to 10.0 mL of 6.00M HCl to prepare a 0.500M HCL solution?

09/25/17

Concentration of Stock

the concentration of stock solution X is 3.6 x 10^-3 M. The concentration of stock solution Y is .15M. If 4.0 mL of X is mixed with 6.0 mL of Y , what is the new concentrations of X and Y?

07/10/17

How many moles of NaCl are in 255 g of a 1.24 m NaCl solution?

If you could work me through the steps, that'd be great. Thanks

06/22/17

What formula would I use?

100 gallon tank of coolant is 3percent concentrated.how do i figure out how many gallons of concentrate to add to achieve a concentration level of 8 percent in this 100 gallon tank.

04/07/17

How much 1M HCl should I add to 100 mL H2O to lower its pH by 1?

It's for a Biology project- I need to have different pH of solutions, with my base point being water with a pH of 7, and then increments down to a pH of 3. I don't know how much HCl to add for each... more

02/23/17

Help me with this. My answer is not coming

The values of Ksp of CaCO3 and CaC2O4 are 4.7 × 10–9 and 1.3 × 10–9 respectively at 25°C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water?

11/30/16

Chemistry/ Concentration

A sample of Potassium hydrogen oxalate, KHC2O4, with a mass of 0.832 grams was dissolved in water and titrated with 25.80 mL of a sodium hydroxide solution. Calculate the molarity of the sodium... more

10/04/16

How many liter of each solution must be mixed?

A chemist has two solutions of HNO3. One has a? 40% concentration and the other has a? 25% concentration.How many liters of each solution must be mixed to obtain 84 liters of a 35?% ?solution?

08/17/16

Concentration with Uncertainty

Timothy has 1 gallon of 6% bleach, assume 94% is water.Timothy decides to dilute the bleach separately. Timothypours 10mL+0.1, 9mL+0.1, 8mL+0.1, 7mL+0.1, 6mL+0.1, and 1mL+0.1, of the bleach into 6... more

11/11/15

how do you make a 10ml solution with a .40m concentration

I know it has to do with molars and making a solution that we can measure how much light goes through it because we are doing concentration.

06/28/15

What is the new concentration when 78.2 mL of a 15.0 M solution of HBr was diluted to 988 mL?

0.908 is the answer. Just need a how to do it. Thanks!

04/25/15

Finding concentration!

Please help if you're able. I really don't understand this at all.    A student has a flask containing nitric acid (HNO3 (aq)). She is not sure what the concentration of this acidic solution is... more

03/09/15

How many grams of calcium nitrate needs to be added to make 400 mL of solution that has a molarity of 2.5?

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02/23/15

Calculate the concentration of a solution with an absorbance of 1.275 (A). The slope is 0.0184 (A)/% and the Y intercept is 0.037 (A). Show your work.

A sample is made up of a solvent only (and reactants other than the compound of interest, if any) is called a blank. If the blank has a measurable absorbance, the the curve has a non-zero... more
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