Platinum is almost completely inert, and it will not react with the sodium. Platinum does have a great capacity to adsorb gases, so if there is some other reaction taking place in the solution which is producing, let us say, hydrogen gas, it is likely to wind up in the platinum.
Sodium hydroxide solution will not react with platinum or gold. Platinum and gold are noble metals that are resistant to corrosion by most chemicals, including sodium hydroxide.
The specific gravity of a solution containing 50 sodium hydroxide is approximately 1.52.
The solution is a liquid containing dissociated sodium chloride.
Sodium hydroxide does not react with platinum under normal conditions as platinum is inert to many chemical reagents, including sodium hydroxide. Platinum is often used in chemical processes precisely because of its resistance to corrosion and reactivity.
This is a water solution containing 5 g dextrose and 0,3 g sodium chloride in 100 mL.
This is a solution containing 100 mg NaCl/L.
There can be elements or compounds in solution. For instance, sodium chloride is a solution of a compound. Conversely, a solution of bromine is a solution containing an element.
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D5 03 NaCl is a medical solution: 5 % dextrose and 0,3 % sodium chloride.
The products are sodium hydroxide and hydrogen.
The pH of a solution containing sodium nitrite would depend on the concentration of the solution. Sodium nitrite is a salt and its solution can be slightly alkaline due to the presence of the sodium ion. However, the specific pH value would need to be measured experimentally.
Hydrogen is released and sodium chloride&sodium hydroxide remain in solution.