Add a pinch of sodium bicarbonate powder to the test tube.

Ormerod SJ, Weatherly NS, French P, Blake S, & Jones WM (1987b) The physiological response of brown trout Salmo trutta to induced episodes of low pH and elevated aluminium in a Welsh hill-stream In: Witters H & Vanderborght O ed.

Photosynthesis takes place in all plants that contain chlorophyll.

How does the rate of photosynthesis change when sodium bicarbonate is added  to the water?

There was no effect of aluminium on sodium efflux at pH 4.0.

dioxide is quiet important for Photosynthesis the formula below shows
how is works:-

[IMAGE]Text Box: Carbon Dioxide + Water Glucose + Oxygen

So I think the two main factors in this experiment that effect the
rate of photosynthesis are the amount of energy produced by the light
and the amount of carbon dioxide available to the plant so when the
carbon dioxide starts running out the amount of oxygen produced will
start dropping so as the level of sodium hydrogen carbonate increases
the amount of oxygen produced will increase.

The Effect of the Amount of Sodium Bicarbonate …

Carbonate used only by itself should only be used if you have a low pH and Alkalinity. If it's to buffer up the Alkalinity, Bicarbonate is better.
To stop the Sodium Carbonate ions from consuming too much H+ and to keep a pH of 7.0 we need to restrict the amount used, as it is always looking for H+ ions to consume. This is why I often prefer using products that not only contain sodium carbonates (or sodium bi carbonates), but the proper ratios of other minor elements such as Calcium and Magnesium.
The use of products such as Sea Chem Buffers; Marine, Gold, Malawi, Victoria for marine tanks and many freshwater tanks (such as livebearer, goldfish, rift lake cichlids) is an example of my preferred methods for KH/Alkalinity maintenance in these tanks. What is noteworthy is that all of the previously mentioned SeaChem buffers have basically the same formula, what differs is concentration and the amount you add to buffer to the desired alkalinity & pH
Aragonite and Seachem Cichlid Salts can also supply carbonates as well.

Photosynthesis requires the following resources; Carbon Dioxide, Water and light.
Obtain two separate cups labeled heated water solution and bicarbonate solution.2.

mM sodium bicarbonate in the ..

Capillary action is the tendency of a liquid to rise in narrow tubes or to be drawn into small openings such as those between grains of a rock. Capillary action, also known as capillarity, is a result of the intermolecular attraction within the liquid and solid materials. A familiar example of capillary action is the tendency of a dry paper towel to absorb a liquid by drawing it into the narrow openings between the fibers. Some liquids exhibit more capillarity than others; for example, there is a big difference between water, salt water, ethanol and hexane. A good EEI would be to compare capillary action (between two microscope slides; see below) for polar and non-polar liquids, or non-polar ones of different density, or salty water vs distilled water, or as a function of temperature or capillary gap. You could also somehow use capillary tubes (see below). The possibilities are huge, but don't get too carried away.

The trial with six grams of sodium bicarbonate provided the best results for our experiment.

Infiltrate the leaf disks with sodium bicarbonate ..

Marine Aquarium alkalinity;
Marine Buffer in particular will stabilize pH at 8.3 and no higher when used at full strength, assuming no problems with exceptional acid production such as decomposition in live rock. At lower doses it can be used in many freshwater applications.
For marine reef aquariums, SeaChem Reef Builder is an excellent buffer that raises alkalinity without an immediate impact on pH. Over time this product will tend to stabilize pH at 8.3
Another advantage of Reef Builder is it is ionically balanced and WILL NOT deplete calcium, strontium, or magnesium which tend to precipitate out with increasing alkalinity, unlike what may happen with popular economy soda ash sodium carbonate products that have more immediate impact on pH (instead of bi-carbonates).

Overall this tells me that sodium hydrogen carbonate does affect the rate of photosynthesis.

How does the concentration of sodium bicarbonate relate ..

If you are using a light meter then just record the the scattered intensity as a function of time (as above) as you try out different concentrations. I made up four solutions of sodium thiosulfate in 50 mL water (0.2g, 0.4g, 0.6g and 1.0g), added acid and measured scattered intensity. Here are my four graphs (left):