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Every precipitate will be collected using a Hirsch funnel. Make definite that the plastic frit disc is firmly snapped in place in your focus. Replacement frit discs are available in case it become clogged or otherwise broken. Attach the funnel to a filter flask, using the neoprene adapter to ensure a good seal among the funnel and the flask. Attach the filter flask to your vacuum line and turn the vacuum on. Swirl the precipitate in solution and quickly pour the mixture onto the filter (while the solids are still suspended). Rinse the precipitate with a minimal amount of ice-cold water. Leave the space on until the precipitate is dry (~5 min.), and take note of the mass.
Q. Define atomic mass units? Atomic mass Scientists have set up a standard for the measurement of atomic mass by assigning the carbon-12 atom a mass of 12 atomic mass units (a
Branched chain polymers - Classification of polymers These are polymers where the monomers are connected to make long chains with side chains or branches of dissimilar sizes.
Which one pair of atoms or ions will have same configuration: (1) F + ans Ne (2) Li + He - (3) C l - and Ar (4) Na and K Ans: Cl - an
Denaturation The structure of the natural proteins is accountable for their biological activity. These structures are arranged by numerous attractive forces among different par
In how many chlorines does Slicon bound The sito four chlorines, and is thus tetrahedral. The Cl-Si-Cl bond angle is 109.5°.
Distinguishing among enantiomers requires a technique that has a chiral attribute. (a) Boiling point does not distinguish among two enantiomers. (b) Optical rotation does ha
given the mobility of hydrogen ion and cl to be 0.0000003623 and 0.0000000791 respectively. calculate the transference number of proton in the 0.001M solution of hydrocholric acid
Mustard Although the primary use of mustard seeds is a condiments, important new food applications are regularly being found. Commercially available mustard products include m
The electronic configuration of copper (29 cu) is: (1)1s 2 , 2s 2 , 2p 6 , 3s 2 , 3p 6 , 3d 9 , 4s 2 (2) 1s 2 , 2s 2 , 2p 6, 3s 2 , 3p 6 , 3d 10 , 4s 1 (3) 1s 2 , 2s
Classification of polymers - Linear polymers These are polymers where monomeric units are linked together to form linear sequential chain. These linear sequential polymers are
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