Busy. Please wait.
or

show password
Forgot Password?

Don't have an account?  Sign up 
or

Username is available taken
show password

why


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.


Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Don't know
Know
remaining cards
Save
0:01
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
Retries:
restart all cards
share
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

TRIPLE Titration

TRIPLE AQA Chapter 4 Calculations Titrations only

QuestionAnswer
What solution goes in the burette? A solution of KNOWN concentration
What do you use to measure accurately 25cm3? A pipette
Describe the titration procedure Fill the burette; pipette25cm3 of UNKNOWN into conical flask; add indicator in flask; open tap; slow down near the end-point; record volume in burette; repeat until concordant results
What is the end-point? The volume for which there is a colour change in the flask for which there is exactly the same amount of acid particles (H+ ions) as there is of alkali particles (OH-)
What is the number of moles in a beaker containing 25cm3 of a 0.2mole.dm-3 solution? Moles=Conc x vol; CONVERT 25cm3=0.025dm3; Moles=0.025x0.2=0.005moles
What is the volume of 0.025moles of a 0.1mole.dm-3 solution? Vol=Moles/Conc=0.025/0.1=0.25dm3;CONVERT 0.25dm3=250cm3
What is the concentration of a solution of 0.2moles in 20cm3? Conc=moles/vol; CONVERT 20cm3=0.020dm3; Conc=0.2/0.020=10moles.dm-3
C6H8O7 + 3 NaOH ⟶ C6H5O7Na3 + 3 H2O 25cm3 of NaOH of concentration 0.102 mol / dm 3 was used to titrate Citric acid. 12.1cm3 of Citric Acid was used at end-point. Calculate the concentration of the citric acid in mol / dm 3 Sucue; show path;shywio and CONVERT 25cm3=0.025dm3 and 12.1cm3=0.0121dm3; moles=concxvol=0.025x0.102=0.00255; ratio=3:1 so moles acid=0.00255/3=8.5x10^-4; conc=mol/vol=8.5x10^-4/0.0121=0.0702mol.dm-3
31.0 cm3 of KOH neutralised 25.0 cm3 of HNO3. The concentration of the dilute nitric acid was 2.0 moles per dm3. HNO3 + KOH --> KNO3 + H2O Calculate the concentration of the KOHin moles per dm3 Sucue; show path;shywio and CONVERT 25cm3=0.025dm3 and 31cm3=0.031dm3; moles=concxvol=0.025x2.0=0.05; ratio=1:1 so moles KOH=0.05; conc=mol/vol=0.05/0.031=1.613mol.dm-3
NaOH(aq) + HCl(aq) --> NaCl(aq) + H2O(l) 27.20 cm3 of 0.100 moles per dm3 sodium hydroxide neutralised 5.00 cm3 of hydrochloric acid. Calculate the concentration of the hydrochloric acid in moles per dm3. Sucue; show path;shywio and CONVERT 5cm3=0.005dm3 and 27.20cm3=0.0272dm3; moles=concxvol=0.0272x0.100=0.00272; ratio=1:1 so moles acid=0.00272; conc=mol/vol=0.00272/0.005=0.544mol.dm-3
Describe how a student could find out the volume of sodium hydroxide solution that reacts with a known volume of acid. Include any measurements the student should make. volume of acid measured using the pipette; acid in flask;sodium hydroxide or acid in burette; indicator in flask; white tile under the flask; slow addition; swirling/mixing; stop when colour of indicator changes; measure volume in burette
What indicator should you use for a titration of unknown Ethanoic Acid by Sodium Hydroxide? Phenolphthalein=weak acid vs strong base; Methyl Orange=strong acid vs weak base; so here as Sodium Hydroxide is a strong base and Ethanoic acid is a weak acid, you should use Methyl Orange
What are concordant results in a titration? Results that are within 0.10cm3 of each other (ie a difference between the highest and lowest value of 0.10cm3 maximum)
How do you work out the average titre in a titration? You ignore the titre (volume) from the rough titration. You only use concordant results (within 0.10cm3)
How many decimal places should you use to record the volumes from a burette? TWO decimal places: the second decimal place should be either a zero (if the bottom of the meniscus is exactly on the line) or a five (if the bottom of the meniscus is inbetween two lines)
What should look at when reading volumes using a burette or a pipette: the top of the meniscus (the bubble)? The middle? Or the bottom? When reading the volume, you should look at the BOTTOM of the meniscus
A student used 20 cm3 of sodium hydroxide solution with a concentration of 0.18 mol / dm3. Relative formula mass (Mr) of NaOH = 40 Calculate the mass of sodium hydroxide in 20 cm3 of this solution Moles=conc x vol; CONVERT 20cm3=0.020dm3; moles=0.020x0.18=0.0036; mass=moles x RFM=0.036x40=0.144g
What indicator should you use for a titration of unknown Sodium carbonate by Hydrochloric acid? Phenolphthalein=weak acid vs strong base; Methyl Orange=strong acid vs weak base; so here as Sodium Carbonate is a weak base and Hydrochloric acid is a strong acid Methyl Orange
What indicator should you use for a titration of unknown Sodium Hydroxide by Hydrochloric acid? Either! Sodium Hydroxide is a strong base and Hydrochloric acid is a strong acid
What is the difference between a burette and a pipette? A pipette measures a known volume of solution whereas a burette measures a varied volume
Created by: ursulinechem2