u/Admirable-Usual-3726

Guys just came to my mind, pehlay question me were they adding vitamin c to dcpip or dcpip to vitamin c?

Table:

Percentage concentration of vitamin c

Drops of dcpip added until solution turns colourless. (Smth like this)

Concentration:

Any number between 0.25 and 0.5

Reason: number of drops required greater than 0.25% solution but less than 0.5%

Source of error:

Drops size vary/ endpoint hard to exactly identify therefore an extra drop can be added.

Adding vitamin c to distilled water/ adding dcpip to distilled water.

Graph

Y axis label

X axis label

Ruled straight line

Value; 0.75 (varies a bit for everyone)

Repeat the experiment using intermediate values b/w 0.70 and 0.80, and plot another graph.

Why exp better;

Calculates actual mean volume, which helps to reduce effect of human error and reduces uncertainty. Similarly, rather than estimating a graph has been plotted for the results, helping to obtain a precise value.

Not sure if this correct I heard it from someone else (clean apparatus)

Y as it's more concentrated.

Exp:

Test tube with fixed volume of distilled water and vitaminc c.

Using a graduated pipette suck a fixed volume of dcpip or a syringe. Measure the temperature.

Add the dcpip to the test tube, and note the volume used until decolorization.

Set up the experiment again, this time add the dcpip to a test tube. Keep the test tube in a test tube rack, and heat in a thermostatically controlled water bath at 30°C. Submerge a thermometer, and allow it to expand. Read at eye level to get an accurate reading, avoiding parrlayx error. Then, take out the test tube using forceps, and suck the liquid again. Add the dcpip to the same volume of vitamin c (and same concentration) Note the volume used.

Repeat this same set up at temperatures of 40°C, 50°C, 60°C and 70°C. Heating should be done for the same duration, timed using an electronic stop watch, for 30 minutes.

Wear gloves and safety googles, to avoid hot spills and hand burns.

Eventually note the temperature at which lemon juice no longer turns colourless, and repeat the experiment again at temperatures below this interval. Plot a graph of your results of temperature on the x axis and volume of dcpip needed to decolurize on the y axis.

Temperature is in the independent variable.

Differences and similarity

Rectangular (regular) for onion epidermis and irregular (slightly oval) for cheek cells.

Onion epidermis has an outer boundary (cell wall)

Both contain one black dot (nucleus)

These answers are not 100% accurate, but made from various sources.