2007年3月26日 · The reaction generates bubbles on the surface that grow in size and effectively shield a significant area of the magnesium from the solution before detatching. Finally, unless the reaction is very strongly stirred, you are relying on the fairly weak currents generated by the upwelling bubbles to deliver fresh HCl solution to the surface of the ...

2013年2月12日 · Enthelpy change of a neutralisation reaction. Mar 4, 2017; Replies 3 Views 2K.

2008年3月6日 · Then, you must weigh out 0.15g, 0.3g, and 0.6g of Mg ribbon and place each sample into its own balloon. The chemical equation for this reaction is Mg + 2HCl --> H2 + MgCl2. To determine the limiting reactant for each reaction, you will need to calculate the number of moles of HCl using the given molarity of 1M.

2010年9月28日 · Hi, I was wondering how much Mg will react with 3M of HCL?

2010年2月22日 · The rate of reaction between Mg and HCl can be measured by monitoring the formation of products, such as hydrogen gas, over time. This can be done by collecting the gas in a graduated cylinder and measuring the volume at specific time intervals.

2009年10月11日 · well i tried to keep the temperature controlled, but the overall reaction is exothermic, but then i used like 0.05grams of magnesium so the temperature change should be really small. BTW I looked up in some textbooks, and apparently due to the small ionic radius and the 2+ charge, the Mg ion acts as a electrophile and pulls the electron density ...

2004年11月14日 · The role of Mg and HCl in this reaction is that Mg is the reducing agent and HCl is the oxidizing agent. The amount of Mg and HCl needed can be calculated using molar ratios. Safety precautions when balancing Mg + HCl include wearing appropriate protective equipment, working in a well-ventilated area, and avoiding skin contact or inhalation of ...

2008年3月9日 · In summary, the conversation discusses a chemical reaction where 20 drops of 1.0M MgCl2 and 10 drops of 0.5M NaOH were mixed with phenolphthalein. When heated, the mixture turned white and when cooled, it turned pink. The question is whether the reaction is endothermic or exothermic.

2016年8月7日 · In summary, the conversation discusses a problem related to stoichiometry, specifically finding the minimum volume of a 27% HCl solution needed to produce 12.1g of H2. The balanced chemical equation for the reaction is Mg + 2HCl → H2 + MgCl2. The solution involves finding the number of moles of HCl required, which is determined to be 12.1 moles.

2006年4月8日 · In summary, the enthalpy of MgO(s) + 2HCl(aq) is a measure of the energy released when one mole of solid magnesium oxide reacts with two moles of hydrochloric acid in aqueous form.