6 marker on standard solution:
1) weigh out a certain mass of MHCO3 using top pan balance and weighing boat
2) dissolve in deionised/distilled water in a beaker and use glass rod to stir
3)pour into 250cm3 volumetric flask (could use a glass funnel)
4) rinse beaker and glass funnel a few times with distilled water and transfer to volumetric flask (maybe 3/4 times) to ensure all MHCO3 is transferred
5) fill up to line with distilled water, making sure the bottom of the meniscus touches the line at eye level
6) put lid on and secure, invert a few times to ensure all solute has dissolved